四、請將下列輪機英文翻譯成中文：
Theoretically, the two-stroke cycle engine, with one working or power stroke
every revolution, develops twice the power of a four-stroke engine of the same
swept volume. The four-stroke engine rotating at medium speed, usually
between 250 and 750 rev/min, is used for auxiliaries such as generators and
sometimes for main propulsion with a gearbox.

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