The practice cf mining room first and then pillars by overhand cut and cemented fill is widely used in China, but the condition for pillars recovery in later period is normally worse.

先房后柱的上向分层胶结充填法在我国应用较为广泛，但矿柱后期回采条件较差。

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The theoretical formulas are developed and applied to the prediction of the rock mass displacements and deformations due to underground mining by pillar-and-room method in mountain areas.

在实测资料统计分析基础上，建立了高陡山区房柱法地下开采岩体移动变形预测分析模型，并给出了岩体变形破坏的极限值。

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Lead door is mainly used for blocking the radiation through the import and export, commonly used in the hospital room, and in mining area.

铅门主要用于需阻挡射线通过的进出口，常用于医院、机房和矿区中。

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"When mining crowds everything out and the economy makes room for that, to service China, knowing that it's a highly volatile global cycle, it becomes a question of what Australia does with the spoils, " he told CNN.

CNN: Australia: Losing 'know-how' economy?

But Fortescue, which is part-owned by Chinese state mining firms, said the tax would hit profits before financing costs, leaving it less room to repay debts.

BBC: Australian miner Fortescue in tax plan threat