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。
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.
在2冲程发动机，向上中风是压缩行程。
On a 2-stroke engine, the upward stroke is the compression stroke.
用飞行翼的上下行程，身体向上移动，但随后的冲程可以对抗这种力量。
With the down stroke of a wing during flight, the body moves up, but the subsequent upstroke can counter that force.
这四招进气行程，紧缩行程，动力冲程和排气冲程。
These four strokes are intake stroke, compression stroke, power stroke and exhaust stroke.
进气冲程在活塞位与气缸顶部（进气门开启，排气门关闭）时开始，在活塞到达其行程的底部时结束。
The intake stroke starts with the pistonat the top of the cylinder (intake valve open and exhaust valve closed) and stops with the pistonat the bottom of its travel.
最后还利用GLIDE软件对活塞在冲程加大后的运动及受力进行了模拟分析，简要的概括了行程加大后活塞和缸套的工作状况。
Finally, GLIDE software is used for analysis of the movement and force of the piston after increasing the stroke, summarizing the operation situation of the piston and cylinder liner.
最后还利用GLIDE软件对活塞在冲程加大后的运动及受力进行了模拟分析，简要的概括了行程加大后活塞和缸套的工作状况。
Finally, GLIDE software is used for analysis of the movement and force of the piston after increasing the stroke, summarizing the operation situation of the piston and cylinder liner.
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