The four strokes in the four-stroke-cycle engine, in their proper order, are intake, compression, power, and exhaust.
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 piston travels down on the intake stroke, up on the compression stroke, down on the power stroke and up on the exhaust stroke.
进气行程，活塞下行；压缩行程，活塞上行；做功行程，活塞下行；排气行程，活塞上行。
On the compression stroke, the piston moves up. The intake valve and exhaust valve close. The piston compresses the air-fuel mixture.
在压缩行程，活塞向上运动，进气门和排气门关闭，活塞压缩混合气。
On the power stroke, the intake valve and exhaust valve close. The spark plug ignites the air-fuel mixture, the piston moves down.
在作功行程，进气门和排气门关闭，火花塞点燃混合气，活塞向下移动。
These four strokes are intake stroke, compression stroke, power stroke and exhaust stroke.
这四招进气行程，紧缩行程，动力冲程和排气冲程。
The intake stroke starts with the pistonat the top of the cylinder (intake valve open and exhaust valve closed) and stops with the pistonat the bottom of its travel.
进气冲程在活塞位与气缸顶部（进气门开启，排气门关闭）时开始，在活塞到达其行程的底部时结束。
The intake stroke starts with the pistonat the top of the cylinder (intake valve open and exhaust valve closed) and stops with the pistonat the bottom of its travel.
进气冲程在活塞位与气缸顶部（进气门开启，排气门关闭）时开始，在活塞到达其行程的底部时结束。
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