a gallon of petrol

A gallon of petrol, which cost less than$ 1.50 in 2002, has only recently dipped below$ 4 a gallon after breaking the threshold eight weeks ago.

汽油价格在2002年不足每加仑1.50美元，但在8周前突破每加仑4美元后，最近刚刚跌至这一关口下方。

Take 10 pence a gallon off the price of petrol.

汽油的价格每加仑减去10分钱。

I need a gallon of petrol.

我需要一加仑汽油。

The car used a gallon of petrol for the journey.

汽车在路上消耗了一加仑汽油。

The US-wide average price for a gallon of petrol has only recently dipped below$ 4 after breaking through the threshold for the first time in early June, according to a daily survey by the American Automobile Association.

根据美国汽车协会（american automobile association）的一份每日调查，自6月初首次突破（每加仑4美元的）关口之后，全美汽油均价最近才刚刚降至4美元以下。