人类活动对一个地区的主要影响之一是水污染。
One eof the main effects of human activity on an area is water pollution.
水污染主要由人类活动产生的污染物而造成的，它包括工业污染源，农业污染源和生活污染源三大部分。
Water main pollutants generated by human activity caused, which includes industrial pollution, agricultural pollution and living most of the three sources.
水污染物源于很多的人类活动。
Water Pollution Water pollutants result from many human activities.
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