作为制定国家相关规定的个人来讲，奥巴马希望取悦那些环保家，通过减少排放气体，减少几乎占美国的总排放的16.4%的三分之一。
By acting to make national rules himself Mr Obama hopes to please environmentalists by cutting exhaust gases, which account for 16.4% of America's total emissions, by nearly a third.
作为制定国家相关规定的个人来讲，奥巴马希望取悦那些环保家，通过减少排放气体，减少几乎占美国的总排放的16.4%的三分之一。
By acting to make national rules himself Mr Obama hopes to please environmentalists by cutting exhaust gases, which account for 16.4% of America's total emissions, by nearly a third.
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