Explanatory text of 400 words introducing smartphones

The mobile phone that everyone is using now is called a smartphone. So what is a "smartphone"? It means that like a personal computer, it has an independent operating system. Users can install software, games and other programs provided by third-party service providers by themselves, and can achieve wireless network access through mobile communication networks. The general name for this type of mobile phone. In fact, I think smartphones evolved from handheld computers and are the scientific combination and sublimation of traditional mobile phones and personal computers. However, they have obvious advantages compared with traditional mobile phones.

Smartphones have brought a lot of convenience to our lives. It can shop online just like a computer. I remember last year the teacher asked us to buy a book. My father went to several nearby bookstores but found nothing, so he had to drive half an hour to Chengxi Xinhua Bookstore to buy it. It took him an entire afternoon to go back and forth. And this year, my mother installed Alipay on her smartphone, and with a few clicks on Taobao, many books were displayed in front of us, and the prices were discounted for us! We got several brand-new books the next day without leaving home. It’s so convenient and affordable! In addition to shopping, mobile phones can also give us directions. This summer I reported online that I participated in a freestyle training class at the Yugang Pao Swimming Pool, but my mother and I have not been to the swimming pool yet. We don’t know the specific location. We only know that it is near the intersection of Tianmushan College. After we took the bus and got off at the intersection of Xueyuan Road, there was no trace of the swimming pool. We walked along Xueyuan Road for more than ten minutes and still didn't see it. At this time, my mother thought of her mobile phone and took out her mobile phone to look up the map, only to find out that we were there. We were going in the wrong direction, and we were walking further and further away. In fact, we were quite close to where we got off the bus. Thanks to this smartphone, otherwise we would have been in completely different directions.

Smartphones have made our communication more convenient. It can chat online just like a computer, but it is more convenient than a computer because it can communicate with each other anytime and anywhere. During the "hand in hand" activity organized by the school, I met Jiang Dingrou, a classmate from Chun'an Maple Ridge Primary School. Usually we can only communicate through letters, which is slow and lacks color because the letters only have black handwriting. This year, I learned her QQ account and used my mother’s smartphone to video chat online. We finally saw each other’s voice and smile. After that, we often chatted about study and interesting things in our class through smartphones in our spare time. The two of us were often "moved" by each other and kept laughing. In June this year, my six-year-old cousin who lives far away from home participated in a martial arts performance of the district children's group and won an excellence award. The moment she received the award, my mother and I were on the road, and her biography was on my mother's smartphone. Good news to come. We video-recorded it right away, and he performed it for me with a clear eye. Although we were hundreds of miles apart, we shared the joy of success together at the first moment.

Of course, the development of smart phones will be broader in the future. Not only can it be used for personal communication, information management, schedule notes, task arrangement, multimedia applications, web browsing, etc., such as: stocks, news, weather, transportation, commodities, application downloads, music picture downloads, etc. It will also be an important means for “smart cities” and “smart homes”. By achieving wireless synchronization, it can release all the functions of a smartphone, making a mobile phone a time management tool, a mobile office platform, and can also remotely control TVs, rice cookers, air conditioners and washing machines at home. It’s really nice to think that all household chores such as laundry and cooking can be handled by mobile phones! I heard from my dad that smart phones have been used in military fields by various countries. For example, using the functions of smartphones such as photography, positioning tracking, inertial sensing, Bluetooth signals, and electronic compasses, wireless remote control can be carried out. That is, through the wireless signals of smartphones, you can remotely control the micro drones and robots you launch, or you can Take over other drones and robots to complete reconnaissance and surveillance tasks, and watch the video images captured by the drone on the display screen in real time. It can also be used for battlefield communication and reconnaissance, and as a battlefield situational awareness terminal...