名词
中文翻译：地下研磨
同义词：
['subsurface milling', 'underground processing']
例句：
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1. The company's underground milling process is highly efficient.
该公司的地下研磨工艺非常高效。
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2. The underground milling of the ore has been greatly improved.
矿石的地下研磨已经大大提高了。
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3. Underground milling technology is a key factor in reducing pollution.
地下研磨技术是减少污染的关键因素。