...-24 中文名:国家地理频道 撞击地球的小行星英文名:National Geographic - Asteroid that Hit Earth资源格式:TVRip版本:[PDTV]发行时间:2010年制作发行:National Geographic地区:美国语言:&nbs..
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也许还可能解释这样的事实，那就是在过去大约1亿年间，撞击地球的小行星的数量是原来预计的两倍。
They are probably also the explanation for the fact that, over the past 100m years or so, the number of asteroids that have hit the Earth is about twice that which would have been expected.
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.
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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