在美国，消费者转而购买节能的车辆，乙醇法规和更高节能经济标准的发布，这些都抑制了对汽油的需求。
In America a shift in consumer purchases towards more fuel-efficient vehicles, ethanol mandates and higher fuel-economy standards have all capped growth in petrol demand.
如果美国一定要利用燃油效率标准来减少车辆排放，那么猛药胜于软药。
If America insists on using fuel-efficiency standards to cut vehicle emissions, then tough ones are better than weak ones.
美国国会的燃油经济标准已每况愈下，而且车辆的平均里程数也跌至数十年来的谷底，但Prius油电混合车的问世，显示人们还可以另有选择。
Federal fuel economy standards languished in Congress, and average vehicle mileage dropped to its lowest level in decades, but the Prius showed people that another way is possible.
中国和美国的油效标准多少没那么严格，但既便如此，对大量生产大型车辆和运动型多功能车的汽车生产商来说，要达到这些标准也还是有困难的。
China and the United States have somewhat less stringent mileage standards, although they can still be hard for automakers to meet if they produce a lot of big cars and sport utility vehicles.
中国和美国的油效标准多少没那么严格，但既便如此，对大量生产大型车辆和运动型多功能车的汽车生产商来说，要达到这些标准也还是有困难的。
China and the United States have somewhat less stringent mileage standards, although they can still be hard for automakers to meet if they produce a lot of big cars and sport utility vehicles.
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