For instance, simply changing the action of intake and exhaust valves in a car while it is running could significantly improve gas mileage.
比如，在汽车行驶过程中，仅仅改变进气阀和出气阀的历程就能显著地提高汽油里程。
The intake or exhaust valves are not sealing properly, again allowing a leak during compression.
进气阀和排气阀密封有问题也会造成压缩时漏气。
In the engine, cams on the CAM shaft cause the intake and exhaust valves to open.
在发动机中，凸轮轴上的凸轮控制进气门和排气门的开启和关闭。
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