气门不过是装在阀杆上加工精细的金属塞而已。当气门就位时（向上移动阀口）时，即可将气门关闭。
The valves are nothing more than accurately machined metal plugs (on long stems) that close the openings when they are seated (have moved up into the openings).
二冲程发动机没有移动的阀，火花塞每次点火活塞到达循环顶端。
A two-stroke engine has no moving valves, and the spark plug fires each time the piston hits the top of its cycle.
当活塞自右向左移动时，缸内液体受挤压，压力增大，由排出阀排出。
When the piston moving from right to the left, the cylinder of liquid by squeezing, pressure, discharged from the discharge valve.
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