进气和排气的气门开合时间随着转速的提高相互交叠，循环着将废气排出。
The intake and exhaust valve opening times will overlap as RPMs rise, recycling some of the charge the outgoing air creates.
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.
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