英语语法分析

Some groups that had descended from the same parent population were no longer reproductively compatible—they had evolved into separate species.

一些由同一亲本群体进化而来的群体在繁殖上不再相容——他们进化成了不同的物种。

That small, reproductively isolated groups of people are susceptible to genetic disease is well known.

众所周知，生育范围越狭小的种族就越易患遗传疾病。

Boys, they reasoned, will thrive reproductively when they have grown big and strong in resource-rich environments.

他们认为在资源丰富的环境下，男性胚胎发育的高大而壮实，从而繁殖生存下来。