Modern science and technology have developed rapidly. I want to know what changes technology has brought to us. When I came home from school, I asked my father.
Dad said that technology has brought too many changes to people. Like the invention of the compass, it promoted the development of navigation and trade, completed the great geographical discovery, and made mankind know the earth; The scientific and technological achievements of hybrid rice and super rice have increased grain output and solved the problem of feeding the world population; Satellites provide us with satellite cloud pictures and weather forecasts, and can also relay TV signals.
Humans have also invented many useful things: telephones, computers and televisions? These things are convenient for people to do something. Just like a telephone: even if two people are far apart, just pick up the receiver and dial a few numbers, and you can hear each other's voice and communicate with each other in a few minutes. It is not enough to have a telephone. Man has invented a computer that is better than telephone. The phone can only hear the voice of the other party, and the computer can communicate by text or video conversation, and you can see the other party. If there is a holiday, send an email and the other party will receive it in a few seconds, which can save paper and let others receive it quickly. The development of science and technology has improved our living standards and quality of life!
In the new century, science and technology will develop faster, make our human life more convenient and serve us at all times. So we should study hard and serve well in the future.
I have a dream: I hope people all over the world can care for the environment, protect the ecological balance of the earth and make our earth more beautiful.
You see, in the streets, markets and parks, you can always see flying plastic bags, wrapping paper, bamboo sticks with spicy kebabs and billboards. Although sanitation workers keep cleaning and picking up, some people turn a blind eye to the garbage bins not far away and throw them around. Around us, there are countless examples of littering, cutting down trees, air pollution and water pollution. All these make our living environment worse and worse, and the quality of life drops rapidly. How can you feel comfortable living in such an environment?
So, when I grow up, I want to be an environmental scientist, specializing in resource utilization and regeneration. We should invent all kinds of environmental protection products, purify water and air, recycle all kinds of garbage efficiently, and reuse all kinds of resources to greatly improve and improve our living environment. We also want to be an environmental protection ambassador and travel around the world, so that everyone can take action, remove garbage, form a good habit of hygiene, make environmental protection deeply rooted in people's hearts, make our environment better, and raise our quality of life to a higher level.
It is my dream and my lifelong pursuit to contribute to environmental protection. I hope my dream can come true as soon as possible, so that our earth tree will be greener, flowers will be redder and birds will sing more melodiously.
Walking on the road every day, you can see all kinds of cars running everywhere, and there are a lot of exhaust emissions. Tail gas floats into the sky, destroying the ozone layer of the city and causing environmental damage; If people inhale too much exhaust gas, it will cause shock and even death. Therefore, I want to invent a super car that combines environmental protection, individuality and technology.
Environmental protection, pollution will not happen again.
Super sports cars no longer use oil, a non-renewable energy source, but inexhaustible solar energy and wind energy. The waste gas can't be discharged any more. In sunny days and scorching sun, the system will enable solar energy, and in cloudy days, heavy rain and heavy snow, wind energy will be enabled, which will no longer pollute the environment. Now, besides exhaust pollution, another big problem is noise pollution. Don't be afraid, as soon as the whistle is changed into beautiful music.
Technology, amazing scientific and technological achievements.
The super car has a voice positioning system. Say where you want to go, and the speaker will give you a hint to guide you to your destination. If the driver drinks alcohol and touches the car body, the system will test the alcohol content, and if it meets the standard, it will be rejected.
Personalization, mood color box.
The supercar has an induction system that knows people's emotions. When they are in a good mood, the car will turn red. When you are in a bad mood, the car body will turn into a darker color.
Now I have to study hard and lay a good foundation before I can invent super cars and benefit mankind.
One day, I went to the suburbs to ride a bike. Suddenly, I saw a crawling black, so I stopped my bike and squatted down curiously to observe it carefully. It turns out that the army of ants is crawling to the top of the hill.
After a while, Xiao Ming came by bike, saw me squatting on the ground, stopped the car and asked me what was wrong. I looked up and said, "Look down, too. The ants are moving." Xiao Ming squatted down and looked at it and said, "I suggest we go home quickly." It is going to rain soon. " I gave him a white look and said, "Cut! Xiao Ming, don't lie to me. How can it rain? Look at the clear sky in Wan Li, just say it's going to rain! " Hearing this, Xiao Ming ignored me and rode back by himself. I continued to wander outside by bike. Soon, the sky suddenly became cloudy. Then I remembered Xiao Ming's words, and I sped up my bike ride back. But I was only halfway through the ride when it began to rain. I was soaked through. When I got home, my mother said, "Oh, go and change it!" "I really regret that I didn't listen to Xiao Ming, but I also feel very confused: What is the relationship between ants moving and rain? I took this question and looked it up online. The results show that ants already know the change of temperature in advance, and if it rains, they will move to a higher place. I also learned a proverb: ants move the snake aisle, and heavy rain is coming.
Nature is wonderful and there are many mysteries waiting for me to discover. As long as we pay attention to observation, we are sure to discover the little secrets in life.
On Sunday, I saw my father's dusty leather shoes and couldn't help sighing, alas! It seems that I should be a coolie again. I picked up my father's dusty leather shoes, painted them with shoe polish and polished them carefully, thus reappearing my youth. Why? I don't doubt it.
So I found a new pair of shoes to compare with the old ones. I first touched the uppers of two pairs of leather shoes and found that the surface of the new shoes was smoother than the old ones. After the old leather shoes are painted with shoe polish, careful observation shows that although they are much brighter, they are still not as good as the new ones. Is there a relationship between the brightness and smoothness of leather shoes?
I went to get a pair of old leather shoes, which looked uneven under a magnifying glass. Then I applied shoe polish to the rough areas 1 and 2 of the leather shoes, and wiped them carefully. The area 2 was not applied as a blank control. I found that the surface of 1 area was much smoother after wiping, and it was brighter in the sun than that of area 2. Why are there such big differences between them?
So I went to ask my father and learned that the surface of leather shoes is not absolutely smooth, but if it is old leather shoes, it is even more uneven, so that it can't reflect light in a certain direction and looks very dim. And some small particles in shoe polish just fill the pits of leather shoes. If the cloth is used to polish the shoe polish, so that it is coated more evenly, the surface of the leather shoes will be smoother and more reflective.
Through the experiment, I finally know the secret of shoes getting brighter and brighter.