名词
中文翻译：Unknown
同义词：
['lapping', 'grinding', 'polishing']
例句：
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1. The lathe is used for cutting and lapping metal parts.
车床用于切割和加工金属部件。
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2. The engineer needs to perform lapping tests on the machine before it can be used.
工程师需要在机器使用前对其进行研磨测试。
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3. The technician carefully lapped the surface of the gear to ensure smooth operation.
技术员仔细修整齿轮表面，以确保顺畅运行。