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.
過去9周，美國汽油零售價格每天都在下跌，駕車者可以從加油站的標志上看到這一事實。另一個不太明顯的趨勢是：駕車者似乎更少開車了。
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