sanitation 六级GRE

Typhoid fever sneaks in when sanitation fails.

环境搞不好,伤寒就会乘虚而入。

A sanitation worker picking up cigarette butts with an "in-dividually decorated bag" in his hand in Zhongguancun, March 9, 2009.

3月9日，中关村过街天桥,保洁员手袋上贴满了从墙上撕下小广告。

The content of lead in the tealeaf is one of important guild line scaling the status of the tealeaf's sanitation by it.

茶叶中铅含量是衡量茶叶状况重要指标之一。