单词：propulsion unit
propulsion unit的用法和样例：
例句
- Marine propulsion shafting is one of the main parts of marine propulsion plant.船舶推进轴系是船舶推进装置的重要组成之一。
- The paddle wheel was the first form of mechanical propulsion for a boat, but has now been almost entirely superseded by more modern forms of marine propulsion.桨轮是轮船机械推进的第一种形式，而现在则完全被现代船舶推进装置所取代。
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