名词
中文翻译：磨石
同义词：
['abrasion stone', 'grinding stone']
例句：
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1.The engineer used an emery rock to smooth the surface of the metal before painting it.
工程师使用磨石来打磨金属表面，以便上色。
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2. The carpenter used an emery rock to smooth the edges of the wood before staining it.
木匠使用磨石来平滑木材的边缘，以便上色。
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3. The scientist used an emery rock to polish the surface of the sample before testing it.
科学家使用磨石来抛光样品的表面，以便测试。