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.
Dear Jack,
I am sorry to hear in the phone call with your father that you were in hospital for you got the A H1N1 virus which made me feel so tense.
I dont know how you got it,however,dont be so scared for the A H1N1 virus is medicable duo to the high tech.You just need to be clam and partner the treatment with the dostors.
Besides,I want to give some advice about how to prevent the A H1N1 virus.Firstly,you mustnt go to the places full of people to reduce the probability of getting it.
Secondly,you should wash your hand before the meals and after you go home from outside.Only do this can you precent yourself from getting it again.
I am looking forward to hearing from you and wish you recover.
Yours,
Lihua
Dear Mike,
You asked me about the present situation of the public transportation in Wuhan in the last letter.
Now, I will communicate the action of the government and my opinion with you.
Firstly, the price of the bus has been cut down, which is very important, I think. Encouraging people to take bus can solve the biggest problem--too much people.
Another way is to develop the bike rental. As we know, car is much bigger than the bike obviously. Driving a car takes up much more place than cycling. So, developing the bike rental is an absolutely correct way to prove traffic circumstances.
Besides, government also builds 4 subway lines under the central of the city and increases the number of the taxis.
In my opinion, all the action above is useful. When the actions above are all finished, the city will be more perfect.
Yours,
Li hua
Dear Chris,
How are you doing? Recently, an important volleyball game will be held in our campus, which will be not only meaningful but also exciting. So, as captain of the team, I, on behalf of all our team members, am writing to invite you to join us in the battle!
Here are some relevant details about it. To begin with, it will be on the 3rd volleyball court from 2:00 to 4:00 on the afternoon of July 1st. Besides, we, the Giants, will confront the Eagles, which is undoubtedly a tough rival. As a result, adequate preparation is urgently needed, including practice, nutrition and a perfect plan.
Hopefully, you could make it to this wonderful event. We need you! Looking forward to your reply and your presence.
Yours,
Li Hua
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