copper precipitation unit

例句：

1. 1. The copper precipitation unit is used to test the purity of the water.
   铜沉淀单元用于测试水的纯度。
2. 2. The engineer designed a new copper precipitation unit for the factory.
   工程师为工厂设计了一个新的铜沉淀单元。
3. 3. The copper precipitation unit can be used to detect pollutants in the water.
   铜沉淀单元可以用来检测水中的污染物。