Composition materials about science and technology

Science and technology is a double-edged sword, and how to use this sword well is a difficult problem facing mankind in the future. The following is the content of the composition materials about science and technology that I have compiled for you, hoping to help you!

The composition material about science and technology-the land under our feet is undergoing earth-shaking changes all the time, all of which come from science and technology!

? Notes before the text of a book or after the title of an article.

A thousand years ago, people lived a simple and hard life. At that time. People don't know what the spiritual world is. They just want to be safe, eat and drink, and maintain a normal life. To this end, people burn incense and worship Buddha and pray for peace. Carriage should be the only means of transportation, but it is expensive, so people have to choose to walk. It takes a long time from Shanghai to Beijing. If you have pneumonia, there is no cure, so people's life span is very short.

Now someone has invented the mobile phone, which has eased the lovesickness and melancholy of people in different places; Someone invented the plane and gave up the long journey of people running around outside; Someone invented an anesthetic to prevent people with this disease from suffering another layer of pain. It is technology that makes our earth smaller and smaller. Now we are no longer satisfied with material enjoyment, but more spiritual comfort. Burning incense and worshipping Buddha still exists. What doesn't exist is people's stupid ideas.

The medical technology developed at present can cure almost all common diseases in life, and the extended people have more time to expand and enjoy life. The rapid development of natural science and technology such as biology and chemistry has brought rich and colorful spiritual food to people who were originally curious. While exploring and inventing, human beings affirmed their self-worth, and while enjoying the benefits brought by science and technology, they also gained happiness.

Once, people marveled at the stars all over the sky; Today, we have been able to send satellites into space.

Once, people were thinking about how to gain a foothold in this law of the jungle world; Nowadays, we are thinking about how to survive in this infighting world.

To transform this society by science and technology, we need to face up to the power of science and technology and make our life better!

The composition material about science and technology is not perfect, even science and technology has advantages and disadvantages.

Nowadays, human beings can't live without technology, which shows that technology is closely related to human life. With the development of science and technology, there are several new generals in transportation: planes, cars, trains, ships and bicycles. Their increase greatly improves the speed of human action and can effectively reduce unnecessary time, thus saving time. The expressway built later shortened the distance between cities. Planes, in particular, can cross the ocean and make people realize their dream of traveling around the world, which was far from being realized in ancient times. And that TV can know news events thousands of miles away without going out. Air conditioning can adjust the temperature, making the room warm in winter and cool in summer. Even more amazing is the computer, which the ancients did not have. It has turned the whole earth into a small village, shortened the distance between people and enhanced the friendship between people. He can also provide people with entertainment and access to information.

However, everything has advantages and disadvantages, even technology is no exception. After people have advanced means of transportation, it is much more convenient, but it also occupies a lot of land resources; Automobile exhaust also harms human health and pollutes the environment, making the air stale and the sky not blue. Air conditioning makes the temperature change abnormally, which makes the indoor temperature differ greatly from the outdoor temperature. When people adapt to one temperature and suddenly go outdoors to adapt to another temperature, it will have a certain impact on the human body. There are computers and televisions, and their radiation is also harmful to people's physical and mental health. Moreover, many movies cheat and commit crimes in the virtual world of the network, and countless teenagers are addicted to online games, thus ruining the bright future of their lives. And computer TV is easy to make people nearsighted.

There is no beauty in the world. Advantages and disadvantages are interdependent. Therefore, in the development of science and technology, it is bound to develop science and technology that will do more harm to mankind.

At school, students' schoolbags are large and small, and the small ones can be easily put into desks, but what about the big ones? But I couldn't put it in, and I thought, if I can make the table move, that would be great!

One night, I had a good idea: hollow out both sides of the desk, and then cut the boards on both sides of the paper into pieces? Me? Shape, in this case, the desk can be moved.

So, I found some small boards downstairs, bought a knife from the canteen, found some nails left over from the previous house decoration at home, and began to plan, first doing the upper part, then the middle part, then trimming the lower part, and finally trimming. After some thinking, I began to do it.

When I do the first half, I cut a rectangular block of wood, then stick two long boards on both sides of the block, and then cut a small rectangular board and stick it under the long boards. Me? Form.

In the middle part, I cut off a rectangular board, glued a similar right-angle board on both sides, and then put the upper part in. At this time, I met a problem: how can I put the upper part in? I thought for a long time before I came up with a wonderful idea: remove a small piece of wood from the top of the right-angle board and it will become a regular strip. So you can put it in. Finally, the stator is used to nail the cut small board firmly, and the problem is solved.

When making the next part, just stick four pieces of wood under it to make four pieces? Legs? . In this way, the movable desk is completed.