Deep mining first blighted the West Virginia landscape.

深挖矿井首先使弗吉尼亚州的风景遭到破坏.

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The several issues were to be faced in deep mining.

提出了现在深井开采中所需解决的几个问题.

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After optimization of deep mining boundary, mining activities become reasonable thus achieving good economic benefit.

通过对境界优化后, 可使采场的开采更趋于合理,经济效益十分显著.

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In deep mining, rock changes from hard to soft, from solid to liquid.

深部开采, 岩石由硬变软, 由固变流.

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