污水灌溉区
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Sewage irrigation has great worth in northern arid areas.
污水灌溉在干旱缺水的北方意义重大。
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Effluents from sewage disposal plants are used in some areas both for irrigation and for the nutrients contained.
废水从污水处理植物是用在一些地区的灌溉与两种营养的火势已得到控制。
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