The disappearance of dinosaurs is not necessarily caused by astronomical incidents.
恐龙的消失并不一定是由天文事件引起的。
The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But alternative explanations are hard to find.
恐龙的消失未必是由天文事件引起的，但是很难找到其他的解释。
Other scientists are debating his theory about the disappearance of dinosaurs.
其他科学家们在辩论他关于恐龙消失的学说。
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