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2013-05-23 12:21
求翻译：In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different from the ratios of European, Asian and Cana- dian gasoline and thus enabled scientists to differentiate （区分） the lead sources. The dominant lead ratio found in the Greenland snow是什么意思？ 待解决
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In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different from the ratios of European, Asian and Cana- dian gasoline and thus enabled scientists to differentiate （区分） the lead sources. The dominant lead ratio found in the Greenland snow
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