但是评论家们指出世界领导们在10年前已经做出了类似的保证。
But critics pointed out that world leaders made a similar promise more than ten years ago.
评论家们指出在那些风力农场十分兴盛的国家风能并未降低二氧化碳的排放量。
Critics point out that wind power hasn't lowered carbon-dioxide emissions in countries where farms are prevalent.
评论家们指出当越来越多的人支付得起手机的时候，很难说是移动电话的使用促进了经济的增长或是经济增长促进了移动电话的普及。
Critics say that it is difficult to tell whether mobile phones are promoting growth, or whether growth promotes the spread of mobile phones as more people become able to afford them.
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