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2013-05-23 12:21
求翻译：Scientists have identified five extinction events in Earth's history, with some so severe that more than 90% of all life forms were killed off. The last and most famous extinction was the Cretaceous-Tertiary event some 63 million years ago that killed off the dinosaurs and allowed the rise of mammals. It is thought to 是什么意思？ 待解决
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Scientists have identified five extinction events in Earth's history, with some so severe that more than 90% of all life forms were killed off. The last and most famous extinction was the Cretaceous-Tertiary event some 63 million years ago that killed off the dinosaurs and allowed the rise of mammals. It is thought to
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