1. Environmental pollution has been partly attributed to effluents from factories. 
   造成环境污染的部分原因是工厂里排放的污水。
2. The townspeople defiled the river by emptying raw sewage into it. 
   市民把未处理的污水倒入河中使河水污染。
3. Then, most important of all, the water must be made free from contamination from sewage. 
   而最重要的是必须使水免于污水的污染。
4. The Office requires that all waste water from construction and camp sites be processed to meet the corresponding sewage treatment standard before discharge. 
   为防止施工作业造成水的污染，建设指挥部要求所有施工污水和营地生活污水均经处理达到相应标准后排放；
5. When industrial waste water or urban sewage is used for irrigation, attention shall be paid to guarding against pollution of the soil, ground water and agricultural products. 
   　　利用工业废水和城市污水进行灌溉，应当防止污染土壤、地下水和农产品。

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