如果一批流星体来自同一颗彗星，形成的就是流星雨。
If a batch of meteoroids comes from the same comet, the meteor shower is formed.
按照一位美国科学家的说法，有一天巨型安全气囊会拯救世界，使我们免于同一颗巨大的彗星发生宇宙大碰撞的灾难。
Giant airbags could one day save the world from the disaster of a cosmic collision with a giant comet, according to a scientist in the United States.
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