The large polyglot, multiethnic communities of today would not, on Aristotle's account, allow for sufficient mutual trust and friendship to count as a healthy political community.

大量精通数种语言者，今日的多民族小区，在亚里士多德看来，将无法提供足够的相互信任与友爱,因此无法被认作是健康的政治社群。

耶鲁公开课 - 政治哲学导论课程节选

I usually ask for advice from a friend who knows those materials very well.

我都会向一个精通电子产品的朋友请教。

What kind of 课堂 - SpeakingMax英语口语达人

And it's in these years after his graduation from college that Milton embarks upon what is essentially a systematic study of all available knowledge. He commands a mastery of just about the entire canon of Western literary and historical learning.

就是在他毕业后的这些年里,弥尔顿开始着手系统的学习,方方面面的知识，他想要精通,整个西方文学和历史经典。

耶鲁公开课 - 弥尔顿课程节选

You'll remember that I mentioned several minutes ago that Milton appears -- literary historians, I think, have rightly seen the Milton who had written Lycidas as a different figure than the poet before having written Lycidas.

你们还记得我刚刚说过,精通文学的历史学家们，恰恰把写出了的弥尔顿,看作和之前的弥尔顿完全不同的一个人。

耶鲁公开课 - 弥尔顿课程节选