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.
这四招进气行程，紧缩行程，动力冲程和排气冲程。
These four strokes are intake stroke, compression stroke, power stroke and exhaust stroke.
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