And sexual selections give rise to a host of organisms, some of which survive and are fit and others which aren't.

性选择导致了大量有机体的产生，其中的一些有机体生存了下来,适应了竞争,而其他则遭到淘汰。

耶鲁公开课 - 心理学导论课程节选

- Now they're writing a more abbreviated form, which you'll probably get to if you take organic chemistry, but really it's the exact same idea.

尽管他们现在会写成更简略的形式，如果你选择了有机化学，你以后很可能也会这样，但本质上并没有任何区别。

麻省理工公开课 - 化学原理课程节选

So, at this point, kept the pre-med, just switched the major to chemistry.

如果你一心一意的要学生物学，我猜你会选择有机化学。

麻省理工公开课 - 化学原理课程节选