50 words on your feelings about the pain and joy in daily life

How do you feel about the pain and joy in daily life in 50 words

At night, the clock kept ticking and passed little by little until it reached 10 o'clock. Lying down at the table, I picked up the pen that was almost out of ink, writing and drawing, as if it would never stop.

As soon as I closed my eyes, the homework on the table, as well as the fatigue, sleepiness, and soreness were all surrounding me. My neck was so stiff that I couldn't move. From this point on, I gradually began to hate studying. Studying was so tiring.

The alarm clock rings, and the sun rises secretly from the east. Everyone admires and loves it, but I am most afraid of the red sun rising, because it means that a hard day is coming. At this time, I was sleeping, and my mother's cry woke me up from my dream. I reluctantly went to wash my face. After that, he lazily took out his book, dragged his tired figure, and walked listlessly to school.

When I came to school, I was infected by the sound of reading, singing, and laughter. My spirits are lifted and I should say "goodbye" to yesterday's "hate". Triangles in Daily Life

In daily life, we often use triangles. Why is this? Because of the stability of triangles, we can see triangles everywhere in our lives. For example, the roofs of some small villas; the brackets of high-voltage telephone poles, etc. are really countless. Triangles had a unique role in ancient times. Early trigonometry was not an independent subject, but attached to astronomy. It was a method for calculating astronomical observation results. Therefore, spherical trigonometry was the first to develop. Greek, Indian, and Arabic mathematics all have trigonometry content, but most of them are by-products of astronomical observations. For example, the ancient Greek Menelaus wrote "Spherology", which proposed the basic issues and basic concepts of trigonometry, especially Menelaus' theorem of spherical trigonometry. But in daily life, the use of triangles is not limited to these. In 2001, Russia invented a new triangular multi-purpose aircraft. This is a small aircraft for two people. The aircraft is named "Cruiz". Made of ultra-lightweight composite material. The aircraft's fuselage is triangular in shape, and its wings can flexibly change flight angles under the control of the pilot. "Cruiz" is equipped with aerobatic, pilot and engine engine control systems, and can complete difficult flight maneuvers with simple operation procedures. It can not only conduct multiple aerial surveillance of forest farms, power transmission lines, and oil pipelines, spray pesticides and fertilize farmland, but also carry tourists to experience thrilling aerobatic flights. His excellent performance is inseparable from the characteristics of the triangle. So triangles are everywhere in our lives. I think if you look carefully, you can find more secrets in triangles. This New Orleans Habitat is called NOAH (New Orleans Arcology Habitat) or Arco (short for arcology). ) is a large triangular building. It covers a city's infrastructure system. NOAH is 1,200 feet tall and can accommodate a population of 40,000. It has residences, schools, commercial venues, retail, hotels, entertainment venues, parking lots and public facilities. A series of green systems are also used, including solar energy, water turbines, wind turbines, etc. The entire building uses solar glass walls. However, this design faced severe challenges in the geographical environment of New Orleans. First, we need to consider dealing with various weather environments and natural disasters. This system needs to be very stable and safe to meet the needs of a population of 40,000. Second, the humidity in New Orleans is relatively high. The building is built on the seaside and is prone to floods and typhoons. Third, the underground soil in New Orleans is mostly soft soil, silt and clay. These conditions make it difficult to build large-scale buildings. We have to marvel at how much such a building would cost and how many years it would take to build it. NetEase Exploration reported on April 28. According to the inhabitat website, the recent design plan of Swiss designer Jacques?

The entire building is 200 meters high, triangular in shape, and made of glass and steel. The designers noted that due to its slender shape, the triangular tower would not cast a shadow on the surrounding streets. In addition, the building uses solar and wind energy as energy supply methods, embodying the concept of green energy. It is reported that Herzog and Mellon are world-renowned design masters. Their works include the Portsmouth Football Stadium in England, the "Bird's Nest" in Beijing, and the De Young Museum in San Francisco. . At the same time, the Triangle Building they designed this time is also the first skyscraper approved to be built in Paris after the 31-year-old ban on building high-rise buildings in the city center was lifted. The first floor of the Triangle Building houses shops, restaurants, offices, a conference center and 400 hotel rooms. According to arrangements, the Triangle Building will be completed in 2014, when it will become the third tallest building in Paris after the Eiffel Tower and Tour Montparnasse. However, the construction of the Triangle Building has also caused dissatisfaction among many residents of Paris. Opinion polls show that 62% of the people in Paris disapprove of the construction of skyscrapers. However, the two designers still believe that the Triangle Building will become part of the beauty of Paris. They said: "The Triangle Building will become one of the new landmarks of Paris. Its unique vertical design not only provides enough space for users, but its novel appearance will also attract the attention of citizens. In addition, the building will also be connected with the surrounding streets. , parks and other facilities are perfectly integrated together, and will become a new tourism resource" (Inspired by the devastating earthquake in Wenchuan, Sichuan, China in May this year, Mr. Chen Mingtang designed these foldable bamboo houses. When he learned that China* ** After receiving the news that he plans to build 1.5 million temporary shelters, he decided to design some temporary houses that are easy to produce, low-cost and environmentally friendly. The geometric folding houses he designed are not only beautiful, but can also be adjusted according to terrain characteristics. According to US media It was recently reported that since the city of New Orleans in the United States was hit by Hurricane Katrina 7 years ago, the reconstruction project is still in progress. Architectural designers headed by Chinese designer Xu Jixun (transliteration) have conceived the idea of ??building a super floating city on the banks of the Mississippi River. , can accommodate 40,000 people. This building called "New Orleans Ecological Building Habitat" is also known as "Noah Building". It has a design height of 366 meters and looks like a hollow modern pyramid from a distance, which can withstand hurricanes. "Noah Building" adopts an open triangular architectural design, which allows wind and rain blowing from any direction to pass freely to offset the destructive force on the building. In order to further relieve wind pressure, the outer corners of the building are specially rounded. Angular and bevel designs. The underground soil of New Orleans is mostly soft soil, silt and clay, which makes it very difficult to build large-scale buildings on land, so the designers simply let the "Noah Building" float on the sea level. The floating city will be placed in a dock with a diameter of 366 meters and a depth of 76 meters. The ground floor will be supported by a vacuum nest made of high-strength concrete. The floating city will consist of three main buildings, each with 30 floors. There is a sky garden as a community space. The entire transportation design is mainly for pedestrians. Only some floors will have electric passages or passenger trams, and elevators will be used to access each floor. This building is enough to accommodate 40,000 residents. All public facilities are available. In order to achieve zero carbon emissions, the floating city's facade is covered with solar panels. The floating city is equipped with passive solar room glass windows, sky garden air-conditioning pipes, sewage treatment, fresh water recycling and storage devices. . However, experts point out that it is still unknown whether such a large ecological building is stable and safe, can cope with various weather conditions and natural disasters, as well as the cost and duration of the project. Japan has experienced many earthquakes since ancient times. Earthquake-resistant buildings are very famous. Most of those buildings have triangular roofs, and the width between the load-bearing walls on both sides is measured so that once they collapse, the two sides of the walls will form a triangle, so that the stability of the triangle can be used to make the trapped people safe. Stay in the wasteland and wait for rescue by rescuers. Moreover, the space inside the "triangle" can also be used to store water and other items to create time for rescue.

Geometric figures in life are so common. Let us observe carefully. "Geometry is everywhere in life." I have three "legs" that form an iron triangle. It is extremely stable, ranging from bicycles and basketball hoops to cranes. , Eiffel Tower, I am present in every aspect of human life. As big as the turrets of the Forbidden City in Beijing, modern bridges, and if the Egyptian pyramids were not triangular, they would not have been able to create the miracle of not collapsing for four thousand years. High tech in everyday life!

The so-called high technology is something that will only appear in 10 or 5 years, or a virtual thing. High-tech focuses on computers, wireless technology, and its applications. A current mobile phone is equivalent to a 486 computer (such as N70) in the past. A mobile phone can easily locate (GPRS positioning) using China Telecom or China Unicom's mobile Internet. In medicine, it is the deciphering of human DNA, allowing us to understand people like gods. . We have made many drugs based on this, such as recombinant human granulocyte factor. In fact, many things are probably not discovered because you are too young and have limited understanding. The steelyard in daily life belongs to

Leverage. Food hygiene in daily life?

In daily life, people often have some unhygienic eating habits and behaviors, but many people have not paid attention to them, which is very harmful to their health. This is what the saying "Diseases enter through the mouth" means. Please note: 1. Develop the habit of washing hands before eating. Human hands do this and that every day and come into contact with all kinds of things. Can be contaminated with germs, viruses and parasite eggs. Wash your hands carefully with soap before eating to reduce the possibility of getting the disease through the mouth. 2. Wash fruits before eating them raw. During the growth process, fruits and vegetables will not only be contaminated with germs, viruses, and parasite eggs, but also residual pesticides and insecticides. If they are not cleaned, they may not only contract diseases, but may also cause pesticide poisoning. 3. Do not eat wild vegetables and fruits casually. There are many types of wild vegetables and fruits, some of which contain toxins that are harmful to the human body. It is difficult for inexperienced people to distinguish clearly. Only by not eating wild vegetables and fruits casually can we avoid poisoning and ensure safety. 4. Do not eat rotten food. When food rots and deteriorates, it will taste sour and bitter; it will emit a peculiar smell. This is caused by the proliferation of bacteria. Eating these foods can cause food poisoning. 5. Do not buy or consume low-quality food and drinks sold by street vendors. These low-quality foods and beverages are often of substandard hygienic quality and can be harmful to health if consumed or consumed. 6. Don’t drink raw water. Whether the water is clean or not is difficult to tell with the naked eye. Clear and transparent water may also contain bacteria and viruses.

Research plan on desiccant in daily life

Ask the question whether this pack of desiccant has deteriorated and what is its composition?

Conjecture: Conjecture 1: All are CaO

Conjecture 2: It is a mixture of CaO and Ca(OH)2 [Source: ]

Conjecture 3: All It is Ca(OH)2

Conjecture 4: It is a mixture of ________

Conjecture 5: ______________.

Experimental exploration makes judgments and fills in the blanks through experimental analysis:

Experimental plan

Experimental operation

Experimental phenomenon

Experimental conclusion

Option 1

Take a certain amount of desiccant in the test tube and add an appropriate amount of water to dissolve it

No exothermic phenomenon

The guess is that ________ is not true

Option 2

Take the supernatant from Option 1 in a test tube and drop the phenolphthalein solution

The solution changes from colorless to red

The conjecture ________ is not valid

Experiment and conclusion In order to further determine the composition of this pack of desiccant, the group of students designed an experiment and obtained a conclusion.

Experimental operation

Experimental phenomenon

Conclusion

Analysis According to the plan 1 in the experimental investigation, it can be seen that the desiccant is soluble in water and does not release any radiation. Thermal phenomenon, use calcium oxide dissolved in water to release a large amount of heat to analyze and guess, and then according to the second plan, it can be seen that the solution is alkaline to judge that calcium hydroxide must be present for analysis;

According to the possible correct guess, we can know , Scheme 3 and Scheme 4 may be correct. Use the properties of calcium hydroxide and calcium carbonate to design experiments, select phenolphthalein and hydrochloric acid, and use the phenomenon that the solution turns red and bubbles emerge, and conclude that the conjecture of Scheme 4 is established.

Answer the conjecture Assuming that quicklime has been left for a long time, it can be seen that quicklime and water will react to form calcium hydroxide. Calcium hydroxide can react with carbon dioxide in the air to form calcium carbonate.

Then guess Number four is a mixture of Ca(OH)2 and CaCO3. We guess that number five is CaCO3, so the answer is: Ca(OH)2, CaCO3; CaCO3;

Experimental exploration of the reasons why there is no exothermic phenomenon and Calcium oxide dissolves in water and releases a lot of heat. It can be seen that conjectures 1 and 2 are not true.

In experimental plan 2, phenolphthalein solution is dripped. If the solution changes from colorless to red, it can be seen that the solution is alkaline, and hydrogen must be present. Calcium oxide, then conjecture five is not true,

So the answer is: one, two; five;

The experiment and conclusion are based on conjectures three and four, choose phenolphthalein and hydrochloric acid reagents, if dissolved in If phenolphthalein is added to the water solution and it turns red, calcium hydroxide is present. If bubbles appear when hydrochloric acid is added, calcium carbonate is present.

Experimental operation: Put a certain amount of desiccant into a test tube, add an appropriate amount of water to dissolve it, Take the supernatant liquid into two test tubes, drop phenolphthalein solution into one, and drop hydrochloric acid into the other;

Experimental phenomenon: the solution changes from colorless to red, and no bubbles emerge (or the solution changes from Colorless turns to red, with bubbles emerging);

Conclusion: The composition of the desiccant is calcium hydroxide, conjecture three is true (or the composition of the desiccant is calcium hydroxide and calcium carbonate, that is, conjecture four Established);

So the answer is: put a certain amount of desiccant in a test tube, add an appropriate amount of water to dissolve it, take the supernatant liquid in two test tubes, drop phenolphthalein solution into one, and drop into the other Hydrochloric acid; the solution changes from colorless to red, with no bubbles emerging; (or the solution changes from colorless to red, with bubbles emerging); the desiccant component is calcium hydroxide, and the three conjectures are true (or the desiccant component is Calcium hydroxide and calcium carbonate, that is, conjecture 4 is true). Products of technology in daily life

Strictly speaking, most of our current clothing, food, housing, and transportation are technological products of different eras.

For example: compared to the ancient times when oil lamps and candles were used, electric lamps are just technological products, aren't they? It’s just that with the development of the times and the progress of society, some technological products have become popular and we have become familiar with them. Perhaps new, better, and more convenient replacement products have appeared, and its past glory has been forgotten.

Modern technological products can be found everywhere in daily life: refrigerators, color TVs, air conditioners, televisions, audio equipment, microwave ovens, water heaters (including gas, electric, and solar), computers, mobile phones, Digital products... In the past century, science and technology have developed by leaps and bounds, and technology products have entered ordinary people's homes faster and faster. It can be said that in modern society, we will be unable to move forward without technological products. Five proverbs related to happiness and suffering in daily life

Only by enduring hardship can one become a superior person.

Helping others is the foundation of happiness.

There is no end to the sea of ??suffering, but when you turn around, you will reach the shore.

Helping others is a virtue.

When Heaven is about to entrust this person with a great responsibility, he must first suffer his mind, strain his muscles and bones, starve his body and skin, deplete his body, and do not mess up his actions.

Of course people should survive, but for the sake of evolution; they may as well suffer, but in order to relieve all suffering in the future; they should fight, but for the sake of reform.

There is no choice between life and death, misfortunes and blessings, let alone beauty and beauty!

Happiness comes from hardship. Only happiness gained through hard work and struggle is true happiness. It is impossible for a piece of happiness to fall from the sky for you to enjoy. How to make students feel the role of mathematics in daily life

1. Create life situations to stimulate students' interest in learning.

Mathematics comes from life practice and serves life practice. In teaching, teachers should start from students' lives, starting from the things around them that students can see and touch, so that students can learn mathematics well. For example, when teaching "Understanding of numbers within 10", you can design an activity class of "Mathematics is around you" to let them find numbers on themselves and tell them what the phone numbers at home are. Digital composition? How many doors are there in the classroom? How many windows? How many people are there in the family? How old are you... When students complete these familiar questions, they are very interested in answering them. They experience the existence of mathematics and the fun of mathematics in the communication. Another example is when teaching "Yuan, Jiao, Fen", a shopping life situation is created, and students are asked to play the role of salesperson and customer respectively, and then conduct group discussions. What did they buy and how much did they spend? The students are all very interested and engaged. Not only do they learn quickly and remember it well, it also allows students to feel the joy of success, thereby enhancing their confidence in learning mathematics well.

Introducing statistical content in the lower grades itself is based on the consideration that children also have statistics around them. Therefore, the more life-like the statistical content is, the easier it is for students to accept it. This section uses situational design to make abstract statistical charts lifelike and interesting, making students happy to accept them.

2. Connect with the reality of life and induce a sense of innovation.

In classroom teaching, teachers should be good at turning mathematical problems into familiar life situations and things of interest to students, allowing them to explore and gain knowledge on their own. For example, in the "Buying Flowers" section of the teaching, the teacher arranged a simple flower shop at the back of the classroom, marked with "Lilies are 3 yuan per branch, carnations are 4 yuan per branch, and chrysanthemums are 2 yuan per branch." If the teacher has ten yuan, , I want to buy a bouquet of flowers. Can you help the teacher design a flower buying plan? This kind of design makes students willing to use their brains to think, actively participate, and design different flower buying plans. Experiencing the joy of success not only mastered knowledge, but also induced their awareness of independent innovation. Another example is when talking about "year, month and day", telling students stories and asking questions: "How old are you this year? How many birthdays have you had? But Xiao Ming only had two birthdays when he turned 8. Why? Want to Do you understand? This is the question we are going to explore today." This problem situation suddenly aroused the students' desire for knowledge and competitiveness. At this time, the new content was taught to the students, making it very easy for them to accept it.

As long as we observe life carefully and guide students to apply the mathematical knowledge they have learned to life, we can truly bring mathematics into life and integrate mathematics into life.

3. Use mathematical knowledge to solve practical problems in life.

"Mathematics Curriculum Standards" requires: enable students to initially learn to use mathematical thinking methods to solve daily life and other practical problems, and enhance their awareness of applied mathematics.

Primary school mathematics, as a basic subject, has its special application value. It is not enough to learn it well. We should also learn to apply it flexibly on the basis of learning and living, so that mathematical knowledge can truly contribute to our learning. , life services. For example, after teaching "left and right", first let students find left and right in themselves, and then organize students to walk on the stairs and on the road so that they can gain direct experience and sublimate daily experience into mathematical experience. In such teaching activities, it not only improves interest and cultivates mathematical ability, but also develops students' good habit of keeping to the right when crossing the road. Another example is when teaching percentage word problems, I created this situation: One day, I went to the store to buy milk, but I didn’t know which kind of milk was cost-effective. Can you use the knowledge you have learned to help the teacher? There are two types of milk that are going to be reduced in price: Type A costs 20 yuan per box and now sells for 18 yuan. Type B costs 30 yuan per box and now sells for 27.5 yuan. Which type of milk has the highest discount? Through exploration, discussion, communication, and verification, the students finally came to the conclusion: type A has a high discount price.

Letting mathematics be closely connected with the reality of life not only cultivates their mathematical awareness and problem-solving ability, but also greatly stimulates their enthusiasm for learning.

4. Arrange practical activities to make students realize that mathematics comes from life and stimulate students' interest.

During teaching, relevant content is arranged for students to conduct small investigations, extending the class to extracurricular activities, which greatly stimulates students' interest. For example, when talking about "Knowing Clocks", students get up, eat, and go to school every day, and time is closely related to them. Before teaching, I gave students an homework assignment: pay attention to the time you get up, eat, go to school, go home, sleep, etc. within a day, and draw it. When teaching a new class, students are asked to share their drawings in the group to inspire students on how to understand clocks, and then teach the new class, which greatly improves students' interest in learning. Another example is teaching "Knowing RMB". During the teaching, I made this design: On weekends, I assigned students a task to help their parents buy things, and write down the names of the purchased items and how much they cost, and see who can remember it accurately. . In the new class period, let students report and communicate their gains in the group. Let students talk about how they know RMB, then show RMB, talk about what they know, and finally carry out corresponding practice activities, so that students can once again experience mathematics everywhere in life and cultivate students' practical ability.

Mathematics is everywhere in life, and life is everywhere in mathematics. In mathematics teaching, teachers should create vivid and interesting life situations to stimulate interest in learning, let students connect mathematical knowledge with real life, actively use mathematical knowledge to solve practical problems, stimulate students' strong desire for innovation, and let them enjoy the creative experience fun, the joy of success, thereby cultivating their independent innovation ability, and at the same time allowing students to feel the close connection between mathematics and daily life, and gradually learn to observe and understand the surrounding things from a mathematical perspective, so that students' mathematical application awareness and practical ability can be improved. Cultivate and improve. What is borax used in daily life?

Molecular formula: Na2B4O7·10H2O Molecular mass: 381.37 Boiling point: 1575℃ Melting point: about 880℃ Chinese name: Borax sodium tetraborate (decahydrate) Moonstone yellow moonstone Borax (medicinal) Industrial borax powder

Sodium tetraborate decahydrate, moonstone sand, sodium tetraborate