would have been的句子 我快疯了

would have been的句子 我快疯了
Such legs would have been far too small to have supported the 50-foot-long Basilosaurus on land.
Basilosaurus was undoubtedly fully marine whale with possibly nonfunctional,or vestigial,hind legs.
would have been 到底怎么翻译 跟后文结合不起来啊

would have been是个过去将来完成时：整句话的翻译：
这样细小的腿在那时还远不能支持这种50英尺长的龙王鲸（Basilosaurus ）生存在陆地上.
龙王鲸无疑是自始至终的海洋生物,尽管可能带有没有作用,或者已经退化的后腿.

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