Corals are anthozoans, the largest class of organisms in the cnidaria group.

VOA: special.2010.08.10

By combining elements as it were of the few and the many polity is characterized by the dominance of the middle class the middle group.

透过结合一些元素,就像前人所为，结合少数人与多数人,政体的特征便转为是,由中间阶级，中间团体所统治。

耶鲁公开课 - 政治哲学导论课程节选

so it's a 250-person class, but we have a group of 50 that we go around with quite a bit.

这是一门250人的课，但是我们组成50人一组一起学习。

跟校友们的关系 - SpeakingMax英语口语达人

What do I have to do to this class-- this side of the class to put you in a different group from this side and different from that side?

我要对这个班做什么-,才能让坐在这一边的同学,和坐在那边的同学处于不同的群体？

耶鲁公开课 - 心理学导论课程节选