Other contributors to cancer risks include local industry emissions, which make up about 25 percent of the average overall risk, and "background" pollutants with no known emission sources.
癌症风险的其它因素包括当地的工业排放物，约占平均总体风险的百分之25，以及不知道排放源的“背景”污染物。
Other contributors to cancer risks include local industry emissions, which make up about 25 percent of the average overall risk, and "background" pollutants with no known emission sources.
癌症风险的其它因素包括当地的工业排放物，约占平均总体风险的百分之25，以及不知道排放源的“背景”污染物。
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