A two-stroke engine has no moving valves, and the spark plug fires each time the piston hits the top of its cycle.

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。

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But look carefully, there are no lurches, pauses, hitches or dead spots in their stroke technique - they have excellent rhythm and timing, moving seamlessly from one phase of the stroke to the other.

但仔细观察，就会发现在他们的划水技术中，没有踉跄，没有暂停，更没有被钩住和死点——他们拥有优秀的节凑和时机，正无缝地从一个相位转到另一个相位。

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He invented a new stroke for his lone rear leg moving it piston like from side to side to achieve both power and stability.

它创造了一种单条后腿跑跳的新方法，腿像活塞似地左右摆动，既有劲又稳定。

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Conventional four-stroke engines produce power by moving a piston up and down using rapid explosions of fuel and air in a cylindrical chamber.

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He was moving millions of dollars at a single stroke.

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