单词	waterwheel
释义	waterwheel /ˈwɔːtəwiːl / noun A large wheel driven by flowing water, used to work machinery or to raise water to a higher level.Surviving machinery includes a waterwheel, shaft and stones, although it hasn't worked since the 1920s.... A stone basin, sealed with pitch, was added later, to combat the problem of silting, and this provided drinking water for ships; it also powered a small waterwheel used to raise water from the basin. He applied mechanics to improve turbines and waterwheels more than doubling the efficiency of the waterwheel.
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