a large wheel fitted with paddles and driven by an engine in order to propel a boat
paddle wheel的用法和样例：
例句
用作名词 (n.)
The paddle wheel was the first form of mechanical propulsion for a boat, but has now been almost entirely superseded by more modern forms of marine propulsion.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。
