The first wrongly assumes that the pterosaurs' hind feet resembled a bat's and could serve as hooks by which the animal could hang in preparation for flight.
第一个（假设）错误地认为翼龙的后脚类似于蝙蝠的后脚，可以作为钩子，用来挂起来准备飞行。
Their skulls, pelvises, and hind feet are reptilian.
它们的头骨、骨盆和后脚属于爬行动物。
Platypuses hunt underwater, where they swim gracefully by paddling with their front webbed feet and steering with their hind feet and beaverlike tail.
鸭嘴兽优雅地在水下游动捕食。 它靠前面有蹼的脚划水，用后脚和海狸那样的尾巴掌握方向。
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