Is the water polluted at source?

河水是在源头受到污染的 吗 ?

《简明英汉词典》

Is the water polluted at source or further downstream?

河水是在源头还是在流出之后受到污染的?

辞典例句

Medium: water, polluted water, oil and weak corrosive liquid.

介质: 水 、 污水 、 油类及其它弱腐蚀性液体.

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BOD 5 is the synthetical evaluation index of water polluted by organic location.

五日生化需氧量(BOD5)是评价水体受有机物污染的相对耗氧指标.

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