名词
中文翻译：上磨石
同义词：
['upper stone', 'upper millstone例句：1. The upper millstone is the part of the mill that grinds the grain.（上磨石是磨机中用来研磨谷物的部分。）2. The upper millstone is essential for grinding the grain.（上磨石对于研磨谷物至关重要。）']
例句：
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1. The upper millstone is the part of the mill that grinds the grain.
上磨石是磨机中用来研磨谷物的部分。
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2. The upper millstone is essential for grinding the grain.
上磨石对于研磨谷物至关重要。
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3. The upper millstone needs to be cleaned regularly to prevent wear and tear.
上磨石需要定期清洁，以防止磨损。