有些历史不论是那些聪明的小学生还是别的人都还不知道,比如,导致这些灭绝的原因是否相似?
But evidence is accumulating that the biggest extinction of all, 252.3m years back, at theend of the Permian period, was indeed also triggered by an impact.
不过有证据不断地证明发生在2亿5230万年前二叠纪时期的那次大灭绝也是因为陨石坠落而造成的。
Nevertheless, though the trigger was the same, the details are significantly different,according to of the University of Western Australia.
然而,按照西澳大利亚大学的埃里克托瓦尔教授的说法,虽然两次大灭绝引发的原因是一致的,但是其中细节却大不相同。
When the dinosaurs vanished they were accompanied by more than 70% of the other animalspecies on Earth.
当时和恐龙一起灭绝的还有地球上超过70%的物种。
At the end of the Permian, the extinction figure was more than 80%.
在二叠纪末期,那场大灭绝带走了超过80%的物种。
And just as the Cretaceous slate-clearing permitted the rise of a hitherto obscure groupcalled the mammals,
就如同白垩纪大灭绝成就了一个迄今为止都未被研究透彻的物种哺乳类动物的崛起,
so the Permian clearance permitted the rise of the reptiles,
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