When the engine of a vehicle revs, or when you rev it, the engine speed is increased as the accelerator is pressed.
例句
The engine started, revved and the car jerked away down the hill...引擎发动了,油门加大后车冲下了山坡。The old bus was revving its engine, ready to start the journey back towards Madrid.这辆旧巴士发动了引擎,准备启程返回马德里。
N-PLURAL
(发动机的)转速
If you talk about the revs of an engine, you are referring to its speed, which is measured in revolutions per minute.
例句
The engine delivers instant acceleration whatever the revs.不论转速如何,发动机都可以立即加速。