In many places, a blanket of clean white snow covers the ground on Christmas Day.
很多地方在圣诞节时，洁白的雪毯覆盖着大地。
But at least once a week, I pick all of my stuff up off the ground and make my side of the room clean again.
但是一周我至少有一次，把我的东西从地上捡起来，把房间里我那一侧打扫干净。
Keyboards can be a breeding ground for bacteria if not kept clean.
如果不注意清洁，键盘就成了细菌滋生的场所。
This paper refers to the concept of clean production and its back-ground and origin.
介绍清洁生产的概念及其产生的背景。
After spraying, clean up the ground in time.
喷洒过后，及时清理地面。
The ground was very dirty, but he managed to clean it.
地上很脏，但他设法打扫干净了。
The ground was very dirty, but he managed to clean it.
地上很脏，但他设法打扫干净了。
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