Because the plastron has a hinge between the pectoral and abdominal scutes the flexibility endowed by the ligaments allows these turtles to close up very tightly.
英
美
释义
由于胸甲和腹甲之间具有铰链关节,可以通过韧带活动,所以它们可以将自己牢牢地闭起来。
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