此次大灭绝之前,兽孔目爬行动物(一种类哺乳动物)的数目远远多于恐龙的祖先祖龙。
Until this disaster, mammal-like creatures known as therapsids were actually more numerous than the ancestors of the dinosaurs, known as archosaurs.
此次大灭绝之前,兽孔目爬行动物(一种类哺乳动物)的数目远远多于恐龙的祖先祖龙。
Until this disaster, mammal-like creatures known as therapsids were actually more numerous than the ancestors of the dinosaurs, known as archosaurs.
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