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paddle wheel

noun
🔊/ˈpædl wiːl/
🔊/ˈpædl wiːl/
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  1. a large wheel on a boat that has boards around its outer edge and is driven by steam to move the boat through the water
    • There were two paddle wheels, one on each side of the ship.有两个桨轮，船的两侧各有一个。