现在主要污染物的范围包括二氧化硫和化学需氧量，为一个衡量水污染程度的指标。
The current scope of major pollutants includes sulfur dioxide and chemical oxygen demand, a gauge of water pollution.
现在主要污染物的范围包括二氧化硫和化学需氧量，为一个衡量水污染程度的指标。
The current scope of major pollutants includes sulfur dioxide and chemical oxygen demand, a gauge of water pollution.
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