一些科学家假定，小行星撞击地球导致了恐龙的灭绝。
Some scientists hypothesize that the extinction of the dinosaurs resulted from the effects of an asteroid collision with Earth.
会不会发生小行星撞击地球的事件呢？
举例说，若有政客提议进行一场防范小行星撞击地球的行动，那他将会被人讥笑，还有可能落选。
A politician who proposed a campaign of preventing asteroid collisions with Earth, for example, would be ridiculed and probably voted out of office.
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