与欧洲的专家们相比，美国研究人员长期以来更担心的是柴油车排放物致癌的可能性。
American researchers have long been more worried than European experts that diesel emissions might be carcinogenic.
与欧洲的专家们相比，美国研究人员长期以来更担心的是柴油车排放物致癌的可能性。
American researchers have long been more worried than European experts that diesel emissions might be carcinogenic.
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