keeping英[ˈkiːpɪŋ]美[ˈkiːpɪŋ]

Edward Lawler at the University of Southern California says these companies may now have difficulty getting and keeping high-quality employees.

VOA: special.2009.10.30

So, and of course, you know, keeping entropy as a fixed variable for a system like that is extremely cumbersome.

所以，对这样的系统要求它们的熵保持恒定,和一个非常笨拙做法。

麻省理工公开课 - 热力学与动力学课程节选

Isn't it difficult being a mother and a professor at the same time and keeping a balance between the two?

同时做母亲和教授是不是很困难呢？两者之间取得平衡不容易吧？

教授的梦想 - SpeakingMax英语口语达人