Help me find diary 200. The requirement of 300 words is both practical and easy to remember.

Whenever I see big brothers and sisters skating freely and carefree on the skating rink, I always feel envious. Look! How comfortable they are. Some run smoothly, some run backwards, and some open their arms while drinking drinks, just like light swallows soaring in the air. On the other hand, I can only stay and watch. ...

One day in the summer vacation, my cousin came to my house. He pulled me aside and said mysteriously, "How about going skating?" ? "Really? Great! " I promised excitedly, but I was worried that I would fall down and make a joke.

Came to the skating rink, bought tickets and put on skates. My brother told me the essentials of skating: "Lean forward a little, bend your legs a little …" My brother said while demonstrating, but I didn't dare to move a step. So my brother took my hand and slowly retreated, while I held my brother's hand tightly and muttered, "You can't let go!" " "My brother said angrily," You can't learn by always relying on me. "I said quickly," no, don't. "Brother or let it go. I stepped back a few steps, grabbed the handrail again and refused to let go, moving like an old woman. My brother saw it and stared at me and said, "How did you learn to be so timid? "I blushed and thought: I am not a stupid child, I must be brave. Thinking of this, I got up my courage again and slipped like my brother. Who knows that I fell on the spot without slipping a few steps. I rubbed my sore ass, got up and continued to slide. My brother is applauding and cheering for me. Gradually, gradually, I seem to find the feeling. The more I skate, the bolder I am and the smoother I skate. I am so happy that my brother praised me: "Sister, you are great! I learn faster than me. "

Now, my skating posture is beautiful. If you don't believe me, let's take a look.

Summer sunshine

In the morning, the sun rises in the east of Ran Ran, and the earth is covered with a layer of red. Gorgeous clouds carry light and give off colorful light. The morning light shines on the lake, and the breeze rises at the beginning, and the fine waves jump, stirring the lake to pieces of gold.

At noon, the sun is no longer gentle in the morning, it shines brightly on the earth. Weeds sleep helplessly in the heat, flowers hang their heads feebly. The wind is like a fan in a stove. It is hot, blowing on the body and burning people hard.

In the evening, the sun gathered dazzling light and turned into a golden disc. Red light is sprinkled on the lake, and several pink clouds are flowing and giving off magnificent light. When it shines on the lake, it shines; It shines on the green trees, and the green trees look greener.

The sunset gave off the last ray of sunshine and left with a smile. However, tomorrow morning, a red sun will rise from the horizon of Ran Ran!

Two packs of jiaozi.

Today, jiaozi is in our home. I jump and jump happily.

I started to pack jiaozi. I was a little unconvinced when I saw my parents' bags. I went over to my mother and said, "Mom, can I wrap it up?" Mom said, "Can you do it?"

I said, "Why not?" In this way, my parents and I wrapped up jiaozi.

I picked up the dumpling skin, put the stuffing in, and pinched it with my hand. Ah, the skin is broken. My mother said, "Can't you?"

I am embarrassed to say, "I am a war hero-a wounded soldier."

After listening to this sentence, everyone began to laugh, and I followed suit.

Alas, it's not easy to package jiaozi. It seems that trivial housework is also learned and should not be underestimated.

Third, I took my sister for the first time.

My sister is only three years old and very naughty. She always plays the big girl temper, and sometimes even her parents can't help it.

Today, I went to grandma's house. As soon as I got home, I saw my sister playing on the sofa in the living room, and I didn't care much. But wait till I get closer, okay? Why is my sister playing with my little book? I was furious and prepared to take it back. But on second thought, my sister is too young to understand. I should treat her as my sister. So, I stopped paying attention to her.

At this time, grandma came over and said that she would go to the market to buy food, and asked me to take my sister to play at home. I patted my chest and said, "Don't worry, grandma!" " "After grandma left, I asked my sister what she wanted to play. My sister said she wanted to play with dolls. My sister and I went to hug some dolls. I dress the doll first. Seeing that my sister was still dawdling, I went to help her. But my sister wouldn't let me, so I grabbed the doll for fear of wasting precious time. However, my sister began to cry, so I had no choice but to return the doll to her. But, who knows, she hit me after the doll.

Today, when I took my sister home, I thought about it for a moment, and I realized that I had treated my parents the same way. So I decided not to treat my parents like my sister in the future.

I am a computer geek.

I am a computer geek. I play games online almost every Saturday. Of course, I often look up information on the Internet, so I can study and play games.

Because I fell in love with the internet, I made a lot of jokes. For example, one day surfing the Internet at home, it was time to eat before you knew it. My mother asked me to eat, and I just said "Oh". After a while, my mother asked me to eat again, and I still said "Oh". Finally, everyone finished eating, and I felt hungry, so I casually asked, "Mom, ok." Mom said, "Everyone has finished eating!" Only then did I know what my mother had just asked me to do.

It's good to surf the Internet. For example, one day my teacher asked us to look for information about the changes in my hometown. I searched all the books, but I just couldn't find any information. I'm in a hurry and don't know what to do. At this time, I used my quick wits and came up with a good idea-looking up information on the Internet. I turned on the computer, looked it up on the Internet and found it in a short time. It's really "I can't find a place to get it, I can get it without effort."

Now, I have another QQ pet online, needless to say. I must feed it. Goodbye!

Five kinds of fruit

Yesterday afternoon, my grandmother took advantage of our inattention and drove her motorcycle back to her hometown in Huilongdu to clean up the house. I haven't come back for dinner at noon today. It's already very cold, and it's raining in Mao Mao outside. We were worried about grandma being frozen, so we decided to pick her up by car.

As soon as I entered the village, I saw green guavas. Second aunt asked; "Do you have guava now?" "Yes!" Mom said. I asked, "Second Aunt, do you want to eat?" My second aunt said, "Yes, and we have to pick them ourselves, ok?" We all said, "Good!" When I arrived at my grandmother's house, I asked if there was anything I could do. Grandma said, "No, I've finished." "Then let's buy guava." We said with one voice. Grandma said, "Then I'll tell my aunt who grows guava." As soon as Grandma and Auntie finished speaking, we rushed over and said to Auntie, "We want to pick it in the field ourselves." Aunt said, "OK, I'll take the bucket to pack it." Then, we went to the guava garden with my aunt. Aunt opened the door and said, "There is a lot of moss in it. Be careful."

As soon as you enter the guava garden, you can see guava trees covered with many big and round fruits, as if to say to us, "Would you like to have a taste?" It's delicious! Sweet and sour. "Looking at this guava, my mouth is watering and I can't wait to take a bite first. Let's choose separately, go here and there for a while. After a while, I picked a lot. Just then, because the ground slipped, I accidentally fell down, which really hurt. Later, we went to menstruation's house to weigh the fruit and asked my mother to pay for it. Then, we went home.

When I got home, my mother cleaned some guavas, cut them into small pieces and gave them to us. We ate them with relish. Although I was covered in mud and my hands were as cold as ice, I was very happy. Next time I have the chance, I will pick the fruit myself.

Six: looking for spring

Humming a ditty, running on the grass and throwing myself into the embrace of nature, this is me looking for spring.

Sitting barefoot on the grass. The grass has poked its head out to touch my feet, as gentle and kind as my mother. My whole body itches and I feel very comfortable. Small buds whisper in the branches. Under the breeze, the next flower nodded slightly, as if she had put on new clothes and celebrated the New Year with us.

I came to the river, and Miss Liu was no exception. Mother-in-law Feng Chun is also combing her slender hair. Miss Liu is dancing happily, and the birds on the branches are accompanying her, singing that beautiful song. Say, what does this willow look like? Like jasper, no, it's too old-fashioned; Like jade, no, it's too tacky. This is a charming but indescribable green. Fascinating; Intoxicating; Fascinating! I was intoxicated by the scenery. ...

I went to the field and saw farmers sowing seeds. Green wheat fields, green wheat seedlings. I can't help but think of the smiling faces of farmers in autumn, all because of spring. I can't help but sigh: if there is no spring, how can there be autumn? It means: if you don't sow in spring, there will be no fruitful fruit in autumn. Friends, don't you think?

Out of the window, in the sky, a few geese passed by in the air, and they arranged in a herringbone shape, as if to say, "hardworking people love spring!" " "The scenery in spring is far more than that.

In spring, Chun Qing hides by the lake and in the fields. I want to catch Miss Chun's braid and go to the world with her!

Seven look at the sea

According to my father, the sea is endless, with no end in sight. My curiosity makes me want to see it. After repeatedly asking my father, my father finally promised to take me to see the long-awaited sea on Sunday.

Is the sea the same as dad said? With questions, I got into my father's car and drove slowly to the seaside.

About half an hour later, we arrived at the seaside. I stood by the sea and looked up and saw a red sun gradually setting. Suddenly, Xia Guang reflected the sea and the whole sky. The tide began to rise, the waves kept coming, and the calm sea became rough. The sea seems to be angry, like a pair of huge hands, roaring and flapping at the sea, rolling up rows of waves. Malik rushed to the beach with lightning speed, and the beach was swallowed up by the sea in an instant, scaring me back to shore.

Looking at this endless sea, I suddenly understand why writers compare the broad mind of human beings to the sea, because the mind of the sea is really so broad.

The sea is beautiful. I like the sea.

Eight: lovely silkworm baby

This week, my father bought me two big silkworms and six small silkworms. I was ecstatic when I got the treasure.

I observed them carefully: it turned out that the silkworm was divided into six or seven limbs, and there were small black spots like stars on both sides of each limb. In front is its head, with small eyes like stars and a small brown mouth. There are six or seven feet under the body, and the feet are covered with fluff, which can be attached to walls and leaves.

Their food can be said to be the simplest and most common, which is fresh mulberry leaves. Unlike other animals, they eat big fish and meat all day.

Silkworm babies eat all day, you will say that they are greedy, but I always think that they are saving energy for cocoon formation and spinning.

A few days later, I found a big silkworm motionless as if it were dead. I also have a black line on me. I thought it was dead, anxious like ants on hot bricks-running around. But dad said it wouldn't die, so I held out a glimmer of hope that it would "live". I observed it for a few days and found that it moved. The yellow "clothes" fell off and I put on a "big white robe". Only then did I wake up and say, "Good for you! How cunning! Dare to pretend to be dead and lie to me. "

Sericulture has a long history in China. China was the first country to raise silkworms. Because our ancestors found that silkworms can spin silk, they raised silkworms and made full use of them to benefit mankind, making silk into gorgeous and noble clothes.

Ah, silent silkworms, isn't your spirit of not asking for anything in return the ideal realm pursued by mankind?

Nine: I learned to stir-fry beef with sand tea.

In my golden childhood, I left many memories of the past, just like the stars in the sky that day, countless. One of the brightest stars is that I learned to stir-fry beef with sand tea. To this day, I still remember it vividly.

Mom and Dad were not at home that day. At noon, my stomach is playing "Empty City Plan". I remember there was some beef left in the refrigerator and rice in the kitchen, so I decided to cook it myself. But for my "little princess", it is simply more difficult than going to heaven. But I believe: nothing is difficult in the world, nothing is impossible to a willing mind.

I can cook and soon lead rice to a dead end-rice cooker. How about fried beef? I don't know anything! I have no choice but to call my mother and ask her.

I slice the beef first, then add a little cooking oil, pine meat powder, sand tea, monosodium glutamate, soy sauce and other seasonings and mix well. Marinate for 10 minute, and then turn on the stove to heat the pot. After that, when I poured the cooking oil into the pot, it was too little. I didn't know at the time. It was found that there was less oil and the beef was burnt when stir-fried with heat. I have to fry another plate. This time, I learned the last lesson, poured more oil, and felt at ease. But when I was frying meat, I accidentally burned it and got a big blister on my hand. This time, I began to flinch. But I think where there is a will, there is a way. Besides, I can't waste beef and gas, so I continue to fry meat. Finally, the meat is fried. I tasted it, it was delicious, and it worked!

From then on, no matter what I do, I can't help but think of this experience. Especially what my mother said to me later: "It's easy to see flowers, but difficult to embroider." Only by learning with an open mind can you succeed. "

Ten fishing

Today, my parents and I went fishing in the fishing field.

We first went to the seaside ferry to take a boat, and soon the boat left. There is a cool sea breeze blowing head-on, seagulls are flying around the sea, and they also skim the sea from time to time to catch fish. Seeing this, I really want to become a seagull and fly to the fishing ground. Soon, we went ashore and the family went to the fishing ground.

We walked to the river, and mother took out the bait and put it on the hook. I picked up the fishing rod and threw the hook into the river. After a while, the red dot began to move up and down, but it didn't move for a while. I pulled it up and saw that the bait was eaten by the fish, but the fish didn't take the bait. Dad also had a "poor record" here, and the fish ran away. Mother gave us bait again and put it in the lake. This time, mom put more bait. After a while, I not only saw the red dot moving up and down, but also saw the fish spitting bubbles. I accidentally forgot the danger and bit it. "hooked!" I let out a cry when I saw the red dot sink, and quickly pulled it up. Unfortunately, the fish was so heavy that I pulled it away. I was so angry that I picked up a fishing rod without bait and paddled around in the river. I lifted it and caught a shrimp seedling. I hung shrimp on the hook as bait. At this time, dad's cry came from the side, "hooked! Hooked! " Dad pulled the fishing rod up, and mom put the fish in the fish basket and accidentally let the fish jump into the river. I was so angry that my family said there was fish essence in the river!

We didn't lose heart and went on fishing. I put the hook down. It's very lively. The fish in the river scrambled to eat shrimp, so I took the opportunity to pull the fishing rod and kill two birds with one stone-I caught two fish. Mother carefully put the fish in the fish basket. Finally, we caught 1 1 fish!

I am so happy today!

Eleventh washing dishes

After breakfast today, my parents went to work, and I was the only one doing my homework at home. Suddenly, I saw several bowls in the dishwashing basin. I thought, "Mom has gone to work, or I'll help her wash it!" " "

I picked up the dishcloth, put some water in the dish-washing basin, added some detergent, picked up the bowl and washed it outside from the kitchen. I accidentally dropped the bowl when I washed the first one. I was afraid of losing another one when I washed the second one, so I washed it carefully. Fortunately, it won't fall. I'll wash it like this. I washed it for the first time. I poured out the detergent water for fresh water and continued washing. I washed the bowl and put it in the disinfection cabinet. I'm so excited to see these bowls so clean!

I think: Mom has to cook when she comes back from work. How difficult it is! I will do more for my mother in the future, and don't make her work too hard.

Respondent: 80670228 1- probation period level 1 2009-8-25 18:59.

Today, my father took us to his alma mater to play. We came to Miaoxi in Huzhou and finally found my father's school. We visited my father's alma mater and climbed the mountain opposite the school.

We came to the front of the mountain. Wow, it's so high! We set off along the winding mountain road. The steeper I climb, the harder it is to walk. My parents are tired. I walked to the first one because I was so excited. I said, "Persistence is victory!" When I said this, my parents were refreshed at once. In a short time, we reached the top of the mountain. There is a pool on the top of the mountain, called the horse drinking pool. Legend has it that the emperor's horse drank water here. I stood on the edge of Shuimatan and looked into the distance. The mountains are endless and foggy. Mother asked me to look down the hill. When I looked down, everything was small. Cars are like beetles, houses are like blocks, and people are like ants. Mother said, "Go down the mountain!" We went down the mountain together.

Although climbing the mountain is very tiring, you will feel very happy when you reach the top.

Respondent: 8793 16862- probationary period level 1 2009-8-26 10:59.

Nasty flies seem to have nothing to do with the grand space cause, but bionics closely connects them.

Flies are notorious "smelly things". They can be seen everywhere and smell bad. Flies have a particularly sensitive sense of smell, and can smell the smell thousands of meters away. But flies don't have noses. What does it rely on to act as a sense of smell? It turns out that the "nose" of flies-olfactory receptors are distributed on a pair of antennae on the head.

Each "nose" has only one "nostril" communicating with the outside world, which contains hundreds of olfactory nerve cells. If the smell enters the nostrils, these nerves will immediately convert the smell stimulus into nerve electrical impulses and send them to the brain. The brain can distinguish substances with different smells according to different nerve electrical impulses generated by substances with different smells. Therefore, the fly's antenna is like a sensitive gas analyzer.

Inspired by this, bionic scientists imitated a very strange small gas analyzer according to the structure and function of the olfactory organs of flies. The probe of this instrument is not metal, but a live fly. A very fine microelectrode is inserted into the olfactory nerve of the fly, and the guided neuroelectric signal is amplified by an electronic circuit and sent to an analyzer; The analyzer can give an alarm as soon as it finds the signal of odorous substances. This instrument has been installed in the cockpit of the spacecraft to detect the composition of the gas in the cabin.

This small gas analyzer can also measure harmful gases in submarines and mines. This principle can also be used to improve the input device of computer and the structural principle of gas chromatography analyzer.

From Fireflies to Artificial Luminescence

Since the invention of electric light, life has become more convenient and rich. But electric lamps can only convert a small part of electric energy into visible light, and most of the rest is wasted in the form of heat energy. The heat rays of electric lamps are harmful to people's eyes. So, is there a light source that only emits light without heating? Humans have turned their attention to nature again.

In nature, many creatures can emit light, such as bacteria, fungi, worms, mollusks, crustaceans, insects and fish, and the light emitted by these animals does not produce heat, so it is also called "cold light".

Fireflies are one of many luminous animals. There are about 65,438+0,500 species of fireflies. Their luminescent colors are yellow-green, orange, and their brightness is different. Fireflies emit cold light, which not only has high luminous efficiency, but also is generally soft, suitable for human eyes, and the light intensity is relatively high. Therefore, bioluminescence is an ideal light source for human beings.

Scientists found that the luminous device of fireflies is located in the abdomen. This light emitter consists of three parts: light emitting layer, transparent layer and reflecting layer. There are thousands of luminescent cells in the luminescent layer, all of which contain fluorescein and luciferase. Under the action of luciferase, fluorescein combines with oxidation to emit fluorescence with the participation of intracellular water. The luminescence of fireflies is essentially a process in which chemical energy is converted into light energy.

As early as 1940s, people created fluorescent lamps on the basis of studying fireflies, which greatly changed the lighting sources of human beings. In recent years, scientists first isolated pure fluorescein from fireflies, then isolated luciferase, and then synthesized fluorescein artificially by chemical methods. Biological light source composed of fluorescein, luciferase, ATP (adenosine triphosphate) and water can be used as a flash lamp in mines filled with explosive gas. Because this lamp has no power supply and does not produce magnetic field, it can be used to clear magnetic mines under the irradiation of biological light source.

Now, people can get cold light similar to biological light by mixing some chemicals for safe lighting.

Electric fish and Volt battery Many creatures in nature can generate electricity, and there are more than 500 species of fish alone. People call these discharging fish "electric fish".

All kinds of electric fish have different discharge skills. Electric ray, electric catfish and electric eel have the strongest discharge ability. Medium-sized torpedoes can generate about 70 volts, while African torpedoes can generate up to 220 volts; African electric catfish can generate 350 volts; Electric eels can generate 500 volts. There is a South American electric eel that can generate up to 880 volts, and it is called the champion of electric shock. It is said that it can kill big animals like horses.

Where is the mystery of electric fish discharge? Through the anatomical study of the electric fish, it is finally found that there is a strange power generation organ in the electric fish. These generators are made up of many translucent disk-shaped batteries, called electric plates or plates. Due to the different types of electric fish, the shape, position and quantity of the electric plates of the generator are also different. The generator of electric eel is prismatic and located in the muscles on both sides of the caudate spine. The torpedo generator is shaped like a flat kidney, arranged on both sides of the body midline, with 2 million electric plates. The generator of electric catfish originated from some kind of gland, located between skin and muscle, with about 5 million electric plates. The voltage generated by a single plate is very weak, but because there are many plates, the voltage generated is very large.

The extraordinary skills of electric fish have aroused great interest. /kloc-at the beginning of 0/9th century, Italian physicist Volt designed the world's earliest voltaic battery based on electric fish power generation organ. Because this kind of battery is designed according to the natural generator of electric fish, the research of electric fish called "artificial electric officer" also gives people such enlightenment: if the power generation organ of electric fish can be successfully imitated, then the power problem of ships and submarines can be solved well.

Jellyfish windward ears

"Swallows fly low before the rain, cicadas sing, and the sky clears up in the rain." Biological behavior is related to the change of weather. Fishermen along the coast know that fish and jellyfish living along the coast swim to the sea in batches, which indicates that a storm is coming.

Jellyfish, also known as jellyfish, is an ancient coelenterate that floated in the ocean as early as 500 million years ago. This lower animal has the instinct to predict storms, and every time before the storm warning, it will swim to the sea to take refuge.

It turns out that in the blue ocean, infrasound (frequency is 8- 13 times per second) generated by the friction between air and waves is always a prelude to storm warning. This infrasound is inaudible to the human ear, but the little jellyfish is very sensitive. Bionics found that there is a thin handle in the ear cavity of jellyfish, a small ball on the handle, and a small auditory stone in the ball. When the infrasound before the storm hit the auditory stone in the jellyfish's ear, the auditory stone stimulated the nerve receptors on the ball wall, so the jellyfish heard the rumble of the coming storm.

Bionics imitates the structure and function of jellyfish ears, designs a storm predictor for jellyfish ears, and accurately simulates the organs that jellyfish feel infrasound. This instrument is installed on the front deck of the ship. When it receives the infrasound wave of the storm, it can automatically stop the horn rotating 360 degrees, and the direction it refers to is the direction of the storm. The reading on the indicator can show the intensity of the storm. This forecaster can forecast storms 15 hours in advance, which is of great significance to navigation and fishery safety.

-Structural members

For members with the same cross-sectional area, it is an effective cross-sectional shape to place the material as far away from the neutral axis as possible. Interestingly, this conclusion is also reflected in the tissues of many animals and plants in nature. For example, the stems of many plants that can resist strong winds are tubular structures with hollow sections. The skeleton that supports people's load-bearing and exercise has dense bone around its cross section, while soft bone marrow fills the cavity. Hollow floor slab, box girder, I-beam, folded plate structure and space thin-walled structure commonly used in building structures are all based on this conclusion.

zebra

Zebras live on the African continent, and their appearance is no different from that of ordinary horses. The stripes on their bodies are protective colors derived to adapt to the living environment. Of all zebras, zebra is the biggest and most beautiful. Its shoulder height is 140- 160 cm, its ears are round and big, and its stripes are thin and numerous. Zebras often stay away from wildebeests, wildebeests, gazelles and ostriches on the grassland to resist natural enemies. The application of zebra stripes in military affairs is a successful example of bionics. .

Supplement (latest development):

The combination of bionics and genetics is the concept of systematic bioengineering, that is, to develop bionics of genetic engineering. Artificial gene recombination and transgenic technology are imitations of natural recombination and gene transfer. Synthetic natural drug molecules and biological macromolecules are bionic at the molecular level, while artificial neurons, neural networks and cellular automata are bionic at the cellular system level. With the development of single-gene genetics and single-gene transfer, bionics has developed to systems genetics, synthetic biology of multi-gene transgene, and systematic bioengineering of nano-biotechnology, bio-computing and DNA computer technology, and bionics has fully developed to the era of artificial biological system from molecules, cells to organs.

Human invention-inspiration from animals Scientists have made the first batch of gas masks in the world according to the unique drug detection ability of wild boar nose. The rocket takes off by using the recoil principle of jellyfish and squid. Researchers have developed many military camouflage equipment for the army by studying the chameleon's color-changing ability. Scientists studied frog eyes and invented electronic frog eyes. The US Air Force has developed a miniature thermal sensor through the "hot eye" function of poisonous snakes. Humans also used the principle of leapfrog to design a toad ram (hang). Humans imitate the highly sensitive sense of smell of police dogs and create "electronic police dogs" for investigation.

Bionics and high-tech scientists have invented artificial dolphin skin which can improve the speed of torpedo by studying the tiny swimming resistance of dolphins. And a wheeled vehicle (jumping machine) that imitates kangaroo's movement in the desert.

Inspired by King Penguin, scientists from the Institute of Zoology of the former Soviet Academy of Sciences designed a new type of car-"King Penguin" brand polar off-road vehicle. The wide bottom of this car is directly attached to the snow surface and supported by a wheel spoon, and the driving speed can reach 50 km/h.

Scientists make space robots by imitating insects.

A research team of Australian National University has developed a small navigation and flight control device by studying several insects. This device can be used to equip small aircraft for Mars exploration.

Inspired by bionics, British scientists are developing a new submarine, which can swim in an S shape by swinging its tail fin. The main innovation is the use of a device called "trunk actuator". "Elephant trunk" consists of a group of thin and soft hoses, which imitate muscle activity and promote fin movement. This new submarine can be used as an underwater mine-clearing submarine to deal with mines that will detonate under the slightest noise or interference.