If it needs only two strokes to complete a cycle, it is called a two-strokecycleengine 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。
2
A two-strokeengine 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。
3
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).