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句子,however,since....这个句子结构到底是要表达什么意思?CR中经常出现 求解 谢谢!!
例如这段话中最后一句 Critics of certain pollution-control regulations have claimed that the money spent over the last decade in order to reduce emissions of carbon monoxide and of volatile organic compounds has been wasted.The evidence they offer in support of this claim might appear compelling:despite the money spent, annual emissions of these pollutants have been increasing steadily.This evidence is far from adequate, however, since over the last decade a substantial number of new industrial facilities that emit these pollutants have been built.
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