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Terms for subject Ecology containing middle-class | all forms | exact matches only | in specified order only
| English | Chinese |
| middle class treatment of waste water | 污水的二级处理 |
| waste water middle class 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 |