更多信息见二冲程发动机工作原理。
随着活塞现在位于下止点且所有气体已经燃烧，重要的是要在工作循环的第四个即最后一个冲程中将所有的已燃废气从气缸中排出。
With the piston now at BDC and all the gases having been burnt, it is important to remove all the burnt gases from the cylinder on the fourth and final stroke of the cycle of operations.
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.
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