n.加仑(容量单位)
The price of petrol is coming down by four pence a gallon.
汽油的价格每加仑降了4便士。
Unleaded gasoline rose more than a penny a gallon.
无铅汽油每加仑涨了1分多。
a five-gallon jug of beer
五加仑装的啤酒罐