名词
中文翻译：Unknown
同义词：
['subterranean mining', 'tunnel mining', 'shaft mining例句：1. The undergroundmining operation is a major source of revenuefor the company.（地下开采作业是该公司的主要收入来源。）2. The tunnel mining project hasbeen underway for several years now.（隧道开采项目已经进行了好几年了。）']
例句：
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1. The undergroundmining operation is a major source of revenuefor the company.
地下开采作业是该公司的主要收入来源。
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2. The tunnel mining project hasbeen underway for several years now.
隧道开采项目已经进行了好几年了。
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3. The shaftmining method is widely used in the extractionof minerals from deep underground.
竖井开采方法广泛用于从深部地下提取矿物。