And that feature is only found in artiodactyls.

而这种特征只存蹄类动物中。

Some very early cetaceans have this ankle bone, too, which tells us that cetaceans evolved from artiodactyls.

一些非常早期的类动物也有这种踝骨，这告诉我们类动物是从蹄类进化而来的。

In other words, if Ambulocetus represents the transition from land to water, then Indohyus represents the transition from artiodactyls to whales.

换句话说， 如果 Ambulocetus 代表从陆地到水的，么 Indohyus 代表从蹄动物到鱼的。

Unlike Ambulocetus, it's not a member of the immediate whale family, but it shares a common ancestor with them, helping to connect today's artiodactyls.

与 Ambulocetus 不同， 它不是直系鱼家族的成员，但它与他们有共同的祖先，有助连接今天的蹄动物。

And these comparisons showed that cetaceans are actually most closely related to a group known as artiodactyls, hoofed mammals that includes hippos, pigs, and deer.

这些比较表明，类动物实际上与称为蹄类动物的类群关系最密切，蹄类动物是有蹄类哺乳动物，包括河马、猪和鹿。