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PBS地-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.

它还有第二个下颌关节, 由与所有现存哺乳下颌关节相同骨头组成——齿骨或下颌骨,以及鳞骨。

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