该区域相对重工业城市污水浓度较低，但较南方城市污水浓度高，属中等浓度城

该区域相对重工业城市污水浓度较低，但较南方城市污水浓度高，属中等浓度城市生活污水，

結果 (英文) 1:

Relatively low concentrations of urban sewage of heavy industry in the region, but higher than the southern cities of effluent, the medium concentration municipal wastewater,

結果 (英文) 2:

The region is relatively low municipal wastewater concentration of heavy industry, but higher than the southern city of effluent, a moderate concentration of urban sewage,

結果 (英文) 3:

The region is relatively heavy industrial city sewage of low concentration, but a southern city sewage concentration is high, moderate concentration of city life sewage,