We all know how important it is to keep our face clean, but how about our pillows?

我们都知道保持脸部的干净又多重要，但是我们的枕头呢？

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But it also has a second purpose-to keep the whole system clean.

另外它还有一个功能——保持整个系统的清洁。

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I try to keep it clean, but I can't keep customers waiting!

我尽量保持干净，但是我不能让客人等啊！

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But it does not keep people from getting health care or clean water to their houses."

VOA: special.2009.11.28

But for the spaces that everyone shares, it's important to keep those clean

但是对于大家分享的区域，一定要保持干净，

有趣的室友们 - SpeakingMax英语口语达人

You want to be hard to beat and keep a clean sheet but you also want to go there to try to get a result.

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"We are not here just to penalise the offenders but also to create an awareness to keep the city clean, " he said.

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Swansea not just scored three goals against lead but secured their 17th clean sheet of the season to keep out the Championship's top-scorers.

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