名词
中文翻译：磨坊石子
同义词：
['millstone', 'waterwheel stone']
例句：
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1. Themillstone is the only thing that keepsthe water moving.
磨坊石是保持水流的唯一东西。
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2. The millstone was usedto grind grain into flour.
磨坊石被用来把谷物磨成面粉。
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3. Themillstone has been in use for overa hundred years.
磨坊石已经使用了一百多年。