the sun rises in the east and sets in the west, which is caused by the rotation of the earth as you all know. but have you ever thought of the effect of the earths rotation on man and can you imagine what would happen if the earth stopped rotating?
the radius of the earth is about 6,370 kilometres. it takes the earth 24 hours to rotate once. objects on the earths equator move with the earth at a speed of 460 metres per second, and the air close to the earths surface turns at the same speed. if the earth stopped rotating suddenly, the air would keep flowing eastward at a speed of 460 metres per second. the wind would be fourteen times as powerful as a hurricane. at the same time sea water would rush eastward at a speed of several hundred metres per second, which might do damages much greater than a seaquake would do. obviously, men could hardly stand such a catastrophe.
even if such a catastrophe would not happen, there would be a great temperature difference on the two hemispheres of the earth, and the four seasons of the year would no longer occur because a day and a night would be as long as a whole year instead of 24 hours. all this would greatly affect the life of human beings, imals and plants and that would cause worse results than anything imaginable.
1 No one can deny the fact that ...
2 The idea is hardly supported by facts.
3 Unfortunately, none of the available data shows ...
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Different people have different views on_____.Some people think that_____,whereas others aegue that __________.
As far as I am concerned, I agree with the opinion that ___________.For one thing,I firmly believe that ___________.For another,_____________.Just think of________,who/which_______.
Taking all these factors into consideration,we may safely come to the conclusion that______.Only if_______can we _______,just as the saying goes,________________.
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In recent years there have been many reports of ________.It turns a new chapter of _________in China,and will have far-reaching effects in the forthcoming years.
The biggest benefit,in my eyes,is that_______.In addition,_______.Finally,______________.
Apart from the benefits mentioned above,we should also face several unavoidable challenges.In the first place,_____________.In the second place,________.What’s more,_______________.In summary,we should_______________.
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Nowadays more and more ______are commonly and widely used in everyday life,ranging from __________to_____________.
The popularity of _______will have a great influence on ______.On the one hand,_________.On the other hand,__________.
To conclude,____________are just like a double-edged sword.With them we may________.However,one point should be kept in mind that we should make sensible use,always being a master instead of slaving of them.
1 A good case in point is ...
2 As an illustration, we may take ...
3 Such examples might be given easily.
4 ...is often cited as an example.
时间过得真快呀,时针“嗒嗒”地飞跃到了20xx年。这时的我,实现了我梦寐以求的愿望,成了发明家。
我和机器人“无比”已发明了机项国际专利产品。这不,我有刚刚发明了一种奇妙的课桌。
这种课桌全是用一种超强的\'特殊玻璃做的。抽屉的左边有一个红色的按钮,右边有一个绿色的按钮。在炎热的夏天,只要你轻轻按一下右边绿色的按钮,桌子就会变凉起来,人伏在上面,顿时会感觉全身凉;寒冷的冬天,也不会担心在桌子上写字时会冻伤手,你只要按一下左边红色的按钮,桌子会变得暖和起来,非常舒服。
如果你读书写字时,姿势不正确,他也可以帮你纠正。比如,胸部与课桌的距离不够一拳头,或者是眼睛与课本没有一尺左右,那他桌前的机械手便会自动纠正你的坐姿。从而保证同学们身体的正常发育。
他还有自动回收功能呢。如果同学们的东西不小心掉在地上,那桌脚的两只机械手就会大显身手,将掉在地上的学习用品捡起来放在桌上,你就不会再弯下腰去苦苦搜寻了。
有人一定会问,这桌子是用玻璃桌的,万一压碎了怎么办?这你就不用杞人忧天了。告诉你吧,它是使用高科技材料做成的,至少可以承受20吨以上的压力,即使你们全班同学挤在一张玻璃桌上,他也安然无恙。
当然,我还的遗憾地告诉你,这种课桌唯一的“缺点”就是:上课时,你的每一个小动作都无法进行,你的一举一动都逃不过老师的眼神,因为课桌是透明的。同学们,这不会给你们带来不便吧?
Recently, there is a popular saying: the world is so large that I want to have a look! As more and more people travel around during their holidays, tourists have brought large sum of money to the local people.
However, too many tourists also bring some problems to the local life. The most serious problem is the pollution caused by the uncivilized tourists. It’s reported that there were thousands of tons of rubbish left after the flag-raising ceremony on Oct. 1st. The uncivilized tourists left their rubbish wherever they go, polluting the local environment. Another problem is the traffic jam caused by so many tourists.
Tourist can promote the economic development of the local areas, but the pollution caused by those uncivilized tourists has brought severe problems. The local tourist authority should set up relative laws to protect the environment of the local areas, and every tourist obey the laws and help to make the places of tourist more beautiful!
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