Rural sewage was one of the reasons that caused rural water environmental pollution, and was an important factor in lake eutrophication.

农村的生活污水，是造成农村水环境污染的原因之一，也是造成湖泊富营养化的重要因素。

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Rather more factors such as economic, environment and hydrology should be taken into account to confirm sewage closure multiplication factor and can hardly be quantitative analyzed.

确定截流倍数要考虑的因素比较多，如经济、环境、水文等，很难进行准确定量分析。

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The sewage irrigation still is the major influencing factor on soil trace element variation during the agriculture production.

污水灌溉仍是农业生产中土壤微量元素变化的主要影响因素。

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