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PBS地球-动物趣闻

It also had a second jaw joint made up of the same two bones as the jaw joints of all living mammals - the dentary or mandible, and the squamosal.

有第二个下, 由与所有现存哺乳动物的下相同的两块骨头组成——齿骨或下骨,以及鳞骨。

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