As we're domesticating cats, we're retaining a lot more of what we call their juvenile characteristics.

我们在驯服猫的过程中，让他们保留了我们称之为幼年特征的东西。

This is a term that refers to the juvenile characteristics of some animals, including humans, being retained into adulthood.

这是一个术语，指的是包括人类在内的一些动物的幼年特征一直保留到成年。

Unlike many other amphibians, which transform into terrestrial adults, axolotls retain their juvenile characteristics and never leave the water.

与许多其他变成陆生成年两栖动物不同，蝾螈保留了它们幼年的特征并且永远不会离开水。