恐龙灭绝的原因

The cause of the extinction of dinosaurs

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1
关于恐龙灭绝的原因，人们仍在不断地研究之中。
With regard to the reasons for the extinction of dinosaurs, it is still being studied.
2
家们宣称，恐龙灭绝的原因很可能是它们没有好好睡上一觉。
Dinosaurs were most likely killed off because they never got a good night's sleep, scientists have claimed.
3
许多科学家认为，地球遭受小行星或彗星的直接撞击可能是恐龙灭绝的原因。
Many scientists believe the Earth suffered a direct hit from an asteroid or that a comet could be to blame for the extinction.

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