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。
If it needs only two strokes to complete a cycle, it is called a two-stroke cycle engine or, for short, a two-cycle engine.
如果发动机完成一个工作循环，只需要两个行程，就称为两冲程循环发动机，或者简称两冲程发动机。
Slow speed diesel engines are large, especially tall, and heavy and operate on the two-stroke cycle.
低速柴油机是体积较大、缸体较长、机身较重的二冲程柴油机。
The size, weight, and cost of the engine per horsepower are therefore less, and two-stroke-cycle engines are used in motorcycles and smaller machines (e. g. , lawnmowers and power rakes).
因此，每马力所要求的机器尺寸、重量和价格成本也就降低了，所以二冲程循环发动机多用于摩托车和小型机器（如割草机和动力耙）。
Some swimmers kick with a six-beat kick in freestyle (six kicks for each stroke cycle), while others use a two-beat kick or a four-beat kick.
有些游泳运动员自由泳做6次打腿(一个完整的自由泳划手周期内作6次打腿)，但有些运动员则作两次或者四次。
In summary, this paper has a certain guide to the design of air-port structure of the uniflow-scavenged two-stroke cycle diesel engines.
总之，本文的工作对二冲程直流扫气柴油机的气口结构方面的设计具有一定的指导意义。
In summary, this paper has a certain guide to the design of air-port structure of the uniflow-scavenged two-stroke cycle diesel engines.
总之，本文的工作对二冲程直流扫气柴油机的气口结构方面的设计具有一定的指导意义。
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