名词
中文翻译：内部研磨
同义词：
['internal polishing', 'internal lapping']
例句：
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1. The machine is designed for internal grinding of metal parts.
这台机器设计用于金属部件的内部磨削。
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2. During the manufacturing process, internal grinding is used to remove any imperfections in the surface.
在制造过程中，使用内部磨削来去除表面任何缺陷。
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3. The engineers are responsible for ensuring that the internal grinding process is carried out correctly.
工程师们负责确保内部磨削过程得到正确执行。