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托福培训
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2016-07-08 17:50
来源：网络来源
作者：上海新东方整理
摘要：你听说过台风吗
Typhoons are some of the worst storms, usually around the Pacific Ocean and the South China Sea. Most happen in July, August and September.
How does a typhoon happen? When lots of sea water gets hot in the summer sun, it evaporates into the air. This makes the air hotter. When the air gets warm enough, it starts to move higher up into the sky. Then, cooler air around it rushes in. It fills the space that is left. After the air gets warmer, it starts to move quickly, making wind. The wind goes in circles, and it keeps moving higher in the sky. The warmer the air gets, the quicker the wind moves. And when the wind moves faster than 30 meters a second, a typhoon begins.
A typhoon has two parts. One is called the “eye”. In the eye, the wind does not move so fast. The other part is the wall of clouds around the eye. This is where the strongest winds and hardest rains are.
Typhoons are very dangerous. In 2006, Typhoon Saomai killed 193 people in Zhejiang, and 11 people were missing. In 2009, Typhoon Morakot hit Taiwan. More than 500 people lost their lives and thousands of houses were destroyed. What to do when a typhoon hits.
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托福培训
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