While some of their clients are middle class professionals from the community at large, many brothels will only accept a narrow clientele to make it difficult for law enforcement to catch them.

VOA: standard.2010.05.24

There may be some inefficiencies, and at some point, if you catch me in the hallway, I can give you a sermon on what goes on inside that reactor.

可能会有某些损耗，如果你能在过道上遇到我的话，我会给你详细讲讲,里面到底发生了什么。

麻省理工公开课 - 固态化学导论课程节选