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2013-05-23 12:21
求翻译：The causes of the other extinctions are not well understood. The largest ended the Permian Period some 250 million years ago. All but about 4% of all species disappeared then. There were three other lesser-known events in the Ordovician (435 million years ago), the Devonian (357 million years ago) and the Triassic (198是什么意思？ 待解决
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The causes of the other extinctions are not well understood. The largest ended the Permian Period some 250 million years ago. All but about 4% of all species disappeared then. There were three other lesser-known events in the Ordovician (435 million years ago), the Devonian (357 million years ago) and the Triassic (198
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