My brother cleans his fingernails with one of his throwing daggers .

我弟弟用他其中一把飞刀清洁他的手指甲。

Beijing , china : a worker cleans the lower windows of an office building

中国，北京：一名工人在清洁一栋办公楼外较低处的玻璃窗

Wang says her home is always covered in dust no matter how often she cleans .

她说无论她怎样搞清洁，家里依然布满尘埃。

A worker cleans the walkways of the chinese knockoff , which opened this weekend .

一名工人在清洁中国仿建的小镇的走道，该小镇将于本周末开幕。

The same technology that cools the air also cleans it : the dust-free environments for high-tech manufacturing require air conditioning .

用于制冷的技术同样也可以清洁空气：高科技制造业所要求的无尘环境就需要空调。