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。
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。
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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