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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.
youdao
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水污染物源于很多的人类活动。
Water Pollution Water pollutants result from many human activities.
youdao
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水污染物源于很多的人类活动。
Water Pollution Water pollutants result from many human activities.
youdao