streams self-purification
河流自净作用 streams self-purification 环境自净作用 environment selfpurification ..
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streams self-purification
流自然净化
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Mountain streams are different from common rivers in hydrological and geological features. So different also are their self - purification mechanism to organic pollutants.
由于山溪与河流的水文和地质条件不同，所以它们对有机污染物的自净作用机理也很不一样。
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