人为什么有膝盖骨,却没有肘盖骨?(来自 Phantom0591

共 2 条评论

  1. Mike

    为了满足某种姿势,所以才有膝盖骨。

  2. jojo

    手臂需要灵活,腿部需要负重,上肢下肢走上了不同的进化之路

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