The retail price of US petrol has declined every day for the past nine weeks, a fact visible to motorists on signs at gas stations. Less apparent is another trend: those motorists appear to be driving less.
过去9周，美国汽油零售价格每天都在下跌，驾车者可以从加油站的标志上看到这一事实。另一个不太明显的趋势是：驾车者似乎更少开车了。
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