Chinese ⇄ English

污水二级处理
oil	sewage secondary treatment
tech.	secondary treatment for sewage; secondary treatment of sewage; secondary wastewater treatment
污水二级处理指在一级处理的基础上，进一步除去污水中的微细粒子，一般是添加硫酸铝等凝聚剂，使微细粒子凝聚，呈絮状物沉降下来，利用絮状物的吸附力，把被吸附的污物除去
ecol.	waste water middle class treatment

污水 二级处理: 21 phrases in 3 subjects

Ecology	2
Technology	15
Water resources	4