principle of waste water purification

• 污水净化原理

principle of waste water purification的用法和样例：

例句

1. The cleaning principle of sapphire wafers is discussed.
   论述了蓝宝石晶片的净化原理。
2. The purification mechanisms,kinds and activations of rare earth catalysts were reviewed.
   综述了稀土催化剂净化汽车尾气的净化原理，催化剂的种类及催化活性。