This is very similar to a 2-stroke engine.
这是非常相似的2冲程发动机。
youdao
Why is the two-stroke engine widely used on board ship?
为什么是二冲程发动机被广泛使用在船上？
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。
The BR500's four-stroke engine is five times cleaner than the standard two-stroke models.
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How does a four-stroke gasoline engine work?
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For years he had contemplated the inefficiencies of the traditional four-stroke Otto cycle engine (named for its 1876 developer, Nikolaus A. Otto).
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