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A typhoon has two parts. One is called "eye(台风眼)". It is right in the middle of a typhoon and it is calm(平静的). The eye of a typhoon can be about 40 kilometers wide. The other part of a typhoon is the wall of clouds around the eye. This is the strongest wind and the hardest rain. Typhoons are very dangerous. They blow away houses and cars. And they can also kill people.