名词
中文翻译：磨石
同义词：
['stone-rubbing tool', 'rubbing stone']
例句：
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1. The carpenter used a rubstone to smooth the wood surface.
木匠使用磨石来平滑木材表面。
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2. The old manspent hours rubbing his stone to removethe stains.
老人花了很多小时用磨石去除污渍。
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3. The engineer designed a specialrub stone for polishing metal surfaces.
工程师设计了一种特殊的磨石用于抛光金属表面。