I got the feeling, when I was talking to some of you guys, that maybe you should brush up on your calculus.

当我和你们中某些人聊天时,我感觉到,你们应该好好复习微积分

耶鲁公开课 - 基础物理课程节选

OCW Self learners are coming to OCW to explore whole new areas of study as well as to brush up on subjects that they took a while ago and perhaps got the rest in the end.

自学者浏览,搜索全新领域的研究,补充学过的科目的知识,使之完整。

麻省理工公开课 - 媒体、教育、市场课程节选

So a young and very capable officer who often became good friend with the president and other staffs and became buddies on the monutain bike with what the president like to do brush clearing on the ranch.

通常是一个非常年轻和能干的官员,通常会和总统,以及其他官员成为好朋友,还有跟总统一起骑车上山,那是总统很喜欢做的事,在牧场上骑马。

普林斯顿公开课 - 国际座谈会课程节选