... backgroung （ambient air） pollution本底污染 background ozone本底臭氧 background monitoring station草酸分子式本底监测站 ...
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The background of ozone bleaching, the properties of ozone, the mechanism and condition of ozone bleaching were briefly introduced.
简要介绍臭氧漂白的背景，臭氧的性质，臭氧漂白的机理及其工艺条件。
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The background level of tropospheric ozone is inexorably rising as volatile organic compounds are released from burning coal and oil.
FORBES: Protesters To Target Koch Brothers' Secretive 'Billionaires Caucus'
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