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An average of 800 tornados occur every year in the USA.
美國每年平均有八百個龍卷風。
They can generate wind speeds faster than 250 mph.
龍卷風的風速可以超過時速二百五十英里。
At times, they devastate whole communities.
有時候，龍卷風會毀滅整個社區(qū)。
Some are over a mile in diameter and can travel distances of 100 miles or more.
有些龍卷風的直徑超過一英里，而且吹襲的距離可以達到一百英里甚至更遠。
