名词
中文翻译：自净常数
同义词：
['self-purification constant', 'self-purifying constant']
例句：
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1. Theself-purification constant of the system is 0.5.
系统的自净常数是0.5。
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2. The self-purification constant of the river is 0.01.
河流的自净常数是0.01。
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3. The self-purification constant of the air is 0.2.
空气的自净常数是0.2。