But the sight of workers wearing white protective suits and gloves hauling in tons of oil-contaminated waste - including bags of sandy tar balls, vegetation,used oil booms, rags and other clean-up supplies - has caused alarm among some Gulf coast communities.

VOA: standard.2010.08.05

Let's clean the board and do some work.

我擦下黑板然后我们讲别的了

耶鲁公开课 - 博弈论课程节选

I mean, you'll get some people who look very preppy and really clean and tidy, and well-presented.

我的意思是，你能看到一些人看起来非常干净整洁，表现出色。

想成为引领时尚的人 - SpeakingMax英语口语达人

You could argue, well, x is in some sense inherently a method, but it's not nearly as clean as what I would like.

你可以争论这一点，好，x在某种意义上，页是一个方法,但是它可能并没有。

麻省理工公开课 - 计算机科学及编程导论课程节选