There are two classes, two broad classes of drug sort of type ligands that are defined, agonists and antagonists.

这样的配体药物有两类,目前已经明确的配体药物大体上分为两种,分别是激动剂和拮抗剂

耶鲁公开课 - 生物医学工程探索课程节选

And the social emotions can be broken down into two categories.

社会情感可分为两类。

耶鲁公开课 - 心理学导论课程节选

There are macronutrients and micronutrients and you've heard of both.

可以分为大量营养素和微量营养素两类

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Now these properties come in two flavors.

可以分为两类。

麻省理工公开课 - 热力学与动力学课程节选

And it really falls into 2 categories.

实际上这可以分为两类。

普林斯顿公开课 - 国际座谈会课程节选

If you look at the percent of time people in society were involved in various activities and broken into agriculture versus everything else, in ancient Egypt it looked like this.

如果你留意一下,人们从事各种社会活动的时间比例,被分为农业生产和其他活动两类,在古埃及,时间分配是这样的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选