run out of gas

(N. Amer. informal)run out of energy; lose momentum

(北美，非正式)沒有能量；缺少動(dòng)力

step on the gas

(N. Amer. informal)press on the accelerator to make a car go faster

(北美，非正式)踩油門加速

gas up

To supply a vehicle with gas or gasoline

加油：給一輛車提供油

gas up a car; gassed up before the trip.

給小汽車加油；在出發(fā)之前把油加好