英语翻译If pollution and resource externalities total 6¢ per vehicle-mile,a strategy that halves per-mile energy consumption and emissions by raising fuel economy from 20 to 40 mpg provides benefits worth 3¢ per vehicle-mile,or $375 per

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英语翻译Ifpollutionandresourceexternalitiestotal6¢pervehicle-mile,astrategythathalvesper-mileenergy

英语翻译If pollution and resource externalities total 6¢ per vehicle-mile,a strategy that halves per-mile energy consumption and emissions by raising fuel economy from 20 to 40 mpg provides benefits worth 3¢ per vehicle-mile,or $375 per
英语翻译
If pollution and resource externalities total 6¢ per vehicle-mile,a strategy that halves per-mile energy consumption and emissions by raising fuel economy from 20 to 40 mpg provides benefits worth 3¢ per vehicle-mile,or $375 per year for a vehicle driven 12,500 annual miles.

英语翻译If pollution and resource externalities total 6¢ per vehicle-mile,a strategy that halves per-mile energy consumption and emissions by raising fuel economy from 20 to 40 mpg provides benefits worth 3¢ per vehicle-mile,or $375 per
这里的that是定语从句,that后面都是修饰这个strategy的,句子的主干是,a strategy(that halves...40mpg) provides benefits worth.
简而言之,a strategy provides benefits.这个策略会带来效益.其他的句子成分都是其修饰和补充作用,来解释具体是什么策略,带来了多少效率.

恩，这里的that 是从句是定语从句，教你一个判断秘诀，那就是你必须明白同谓语从句的最主要特征是一般为that 引导的，而且that 后面的从句部分的成分必须要齐全，像这个句子，that 后面直接跟动词而不是跟名词，所以就为定语从句，这两个相似的从句经常会混乱，希望能帮到你，翻译的话，有点长，偶在上课，没办法帮你翻译了，呵呵。。。...

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定从，a strategy的定语，整句译为：

若环境污染和资源外部效应每行车里程成本为6 cents，那么一个将燃油经济性从20 mpg(英里每加仑)提升至40英里每加仑，从而将每行车里程能耗和排放减半的方案，提供的效益价值3 Cents/行车里程，或375美元/年（按单车每年平均驾驶里程12500英里计算）。...

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定语从句，修饰a strategy
If pollution and resource externalities total 6¢ per vehicle-mile, a strategy 【that halves per-mile energy consumption and emissions by raising fuel economy from 20 to 40 mpg】 provides benefits worth 3¢ per vehicle-mile, or $375 per year for a vehicle driven 12,500 annual miles.

原文大意：
如果污染和资源外部因素在每辆车每英里总计耗费6美分，有一个对策可以产生3美分的收益（节省3美分的耗费），或为一辆年度行程达到12500英里的车每年产生375美元的收益，那就是通过提升燃料经济性，增加每加仑燃料所行英里数，从而把每英里的能源消耗和排放减半。

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