The domestic sewage discharge is the important source of non-point pollution in rural area.
农村生活污水是农村面源污染的重要来源。
The water pollution can be divided into two major categories of point source and area-source pollution according to the different way of discharge.
根据排放方式的不同，水体污染可以分为点源污染和非点源污染两大类。
Major causes for pollution from daily operation of oil depots are analyzed. Pollution source includes evaporation and leak of oils and discharge of contaminated water.
介绍了石油库在日常作业过程中对环境带来污染的主要原因，污染源为油品蒸发、油品泄漏和油库污水。
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