没有四肢不仅更适合游泳，也更适合钻洞。这也引发了关于爬行类动物进化的问题。

Not only is it more efficient to swim without limbs, burrowing without legs is also better, and this raises questions about the twists and turns of reptilian evolution.

youdao

没有四肢不仅更适合游泳，也更适合钻洞。这也引发了关于爬行类动物进化的问题。

Not only is it more efficient to swim without limbs, burrowing without legs is also better, and this raises questions about the twists and turns of reptilian evolution.

youdao