名词
中文翻译：Unknown
同义词：
['grinding', 'polishing', 'sanding']
例句：
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1. The engineer bit grinding the metal to make it smoother.
工程师正在对金属进行磨削，使其更光滑。
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2. The car was polished to a shine after being driven for years.
这辆车经过多年的驾驶后被抛光，变得闪闪发光。
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3. Sanding the wood to remove the rough spots made it look more uniform.
用砂纸打磨木材，去除粗糙的地方，让它看起来更均匀。