名词
中文翻译：Unknown
同义词：
['mill', 'millstone', 'grindstone']
例句：
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1. The millstone is still in the river, and it's hard to tell where it went.
河里的水轮还在，很难确定它去了哪里。
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2. The millstone was so worn that it could be used as a spoon.
水轮磨损得很厉害，可以当作勺子使用。
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3. The millstone is a symbol of the power of human labor.
水轮是劳动力量的象征。