可以想象，最终，那些不能用后腿站立的猫咪就都灭绝了，而能立起来够到食物的猫咪就生存了下来，繁衍生息。

In time, the cats who couldn't manage that trick would die out. The ones who could manage it would survive and reproduce. A cycle begins.

youdao

我想，他还是管住了它，就象一个果断的骑师管住一匹用后腿站立起来的骏马。

He curbed it, I think, as a resolute rider would curb a rearing Steed.

youdao