protractile limbs and claws.
可伸展肢体和爪子
protractile limbs and claws.
可伸展肢体和爪子
when the upper lip is connected to the snout by a frenum, the two are continuous and the upper jaw is restricted from being protractile;
上嘴唇被一个系带连接到吻,两者是连续,而上颌则是被局限不能伸出;
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