A mile travelled by a large truck full of groceries is not the same as a mile travelled by a sport-utility vehicle carrying a bag of salad.
跑一英里路，满载食杂用品的大型卡车与只带了一袋色拉的休闲越野车所耗能源是截然不同的。
A mile travelled by a large truck full of groceries is not the same as a mile travelled by a sport-utility vehicle carrying a bag of salad.
跑一英里路，满载食杂用品的大型卡车与只带了一袋色拉的休闲越野车所耗能源是截然不同的。
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