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High-Tech Expo will be quietly into the footsteps of our campus, the annual "scientific and technological Month" activities started!

We look forward to the most interesting is the High-Tech Expo will be it! Day after day passed, and finally to Saturdays! It is with emotion sitting in their seats, Hao teacher "order", we will quickly pick up the experimental equipment in high spirits to start the experiment.

"We have to do is this group of 'interesting siphon' welcome to visit!" I cried loudly, Sun Xuhui only curiosity left over, we looked suspicious, I did not miss a good opportunity for each, said: " , Take a look at our test! "You do not want to see the glass reversed, changing the water will be able to go to it? "I like the" bombard "like to introduce a non-stop," Oh, look carefully! First of all, the pipe filled with water, followed after a glass of water, access to water 1 cup on the table, the empty 2 cup lightly boosting, and low point, "Bai Baishou I let Yan Kai-day 2 cups hold air at the same time Fanlianniejin the end of the tube, I gently hose and hold the other end, went on to say: "I have to do a good job of this process, and then look! Now, we were put on both ends of the glass are No. 1 and No. 2 empty cup, there have been wonderful scene, 1 cup of water flow on a 2 cup. Gradually, you will find that 1 cup of the air, on the contrary, the 2 cups filled with 1 cup of water. You want to know why? "Sun Xuhui see Huale Yan, Siyousiwu nodded, as if a child's desire for knowledge, taking advantage of this time, I had to step up the" attack ":" The principle is to siphon hose in the liquid, and the two ends are Niejin So Guanzi have a negative pressure, and then put them into two cups, to promote access to the water hose, which is siphon! "I nod after presentation, Sun Xuhui nodded, satisfied to leave our team.

High-Tech Expo will, "visit" the group more and more people, this could be really popular science projects ah! High-Tech Expo will be the end, I think wistfully: Qin minds, our life is full of interesting, original, primary and secondary school students which we can hold our own, "Cobo" Yes!
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第1个回答  2013-11-11
Science and Human Life

Science has greatly changed human life. Come to think about and make a comparison of our present life with what it was 50 years ago. At that time, motor-cars, aero planes and atomic energy were still in the course of development. Thus everyday life was not so comfortable as today. However, there is great change with the advance of science aroused by our scientists. They try to create new cultivation and they also turn barren soil into fertile land.

But science may be used wrongly, too. If it’s operated by divide persons, its power can be destructive and terrible. Take atomic energy for example, from one hand, it can help us to offer plenteous electricity. Yet, from another one, it can also be used to destroy thousands of lives in the war.

In brief, science provides us with many benefices, but sometimes man has misused it. Therefore, we should utilize science more effectively.
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