• 奥陶纪大多数生命生活海洋里,所以海洋生物例如腕足类动物笔石动物的数量此时急剧减少

    During the Ordovician, most life was in the sea, so it was sea creatures such as trilobites, brachiopods and graptolites that were drastically reduced in number.

    youdao

  • 奥陶纪大多数生命生活海洋里,所以海洋生物例如腕足类动物笔石动物的数量此时急剧减少

    During the Ordovician, most life was in the sea, so it was sea creatures such as trilobites, brachiopods and graptolites that were drastically reduced in number.

    youdao

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