作功冲程耗尽了所有的气体，这样就必须采取相应的措施排出废气以及向气缸内再充入新鲜的可燃混合气：气体的运动由气门来控。
The power stroke "uses up" the gas, so means must be provided to expel the burnt gas and recharge the cylinder with a fresh petrol-air mixture: this control of gas movement is the duty of the valves;
四冲程循环发动机中，四个冲程的固定顺序是：进气、压缩、作功和排气。
The four strokes in the four-stroke-cycle engine, in their proper order, are intake, compression, power, and exhaust.
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