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This is very similar to a 2-stroke engine.
这是非常相似的2冲程发动机。
youdao
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On a 2-stroke engine, the upward stroke is the compression stroke.
在2冲程发动机，向上中风是压缩行程。
youdao
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A 2-stroke engine also goes through four actions to complete one operating cycle.
两冲程发动机也经过四次行动完成一个工作循环。
youdao