This can help a worker keep his nose clean or stay out of trouble.

VOA: special.2009.09.13

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

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