我觉得，这怒气是一种返祖现象。

This anger, I think, is atavistic.

换句话说，鼹钝口螈的变态是一种返祖现象。

In other words, metamorphosis in mole salamanders is an atavism.

如果多洛定律是正确的，返祖现象应该很少发生。

If Dollo's law is right, atavisms should occur only very rarely.

这正是伴随着她病弱身体的老年返祖现象的一种麻木冷淡的特征。

It was characteristic of an old, atavistic callousness that went with her delicacy.