For a species of land dwelling primates, humans make surprisingly good divers.

对于一种陆地栖息的灵长类动物， 人类是出奇的优秀潜水员。

Long before chickens evolved, land dwelling animals developed the ability to lay hard-shelled eggs.

早在鸡进化之前，陆栖动物就具备了产硬壳蛋的能力。

Regarding the number of toes, the ancestor of all egg laying land dwelling animals had five toes on each foot, so that isn't a distinct enough feature to link Dimetrodon to mammals.

关于脚趾的数量，所有产卵陆生动物的祖先每只脚上有五个脚趾，因此这一明显特征不足以将异齿龙与哺乳动物联系起来。