water air passage

There was also passage of the Clean Water Act and the Clean Air Act was strengthened.

《清洁水法》也通过了，并且《清洁空气法》也得到了支持。

Plastic rockery stone stability is mainly rely on the main structure completed, but with the passage of time, steel in the process of contact with air and water, prone to corrosion and rust.

塑石假山的稳定性主要靠主结构来完成，但随着时间的推移，钢材在接触空气及水的过程中，容易发生腐蚀、生锈。

The reserved water in the dump bucket obstructs return air in an excrement passage.

翻斗里的存水隔断了粪便通道的回气。