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.

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在二冲程发动机中你必须混和燃料和气体，因为气缸壁上的孔阻止使用活塞环密封燃烧室。

You have to mix oil into the gas in a two-stroke engine because the holes in the cylinder wall prevent the use of rings to seal the combustion chamber.

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转子活塞发动机用的是四冲程循环，但是它们和四冲程活塞发动机有很大不同。

Gas turbine engines use the Brayton cycle. Wankel rotary engines use the Otto cycle, but they do it in a very different way than four-stroke piston engines.

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