The natural grade classification of loose-covered rock has a great effect on caving mining efficiency.

松散覆盖岩层的自然分级现象对使用崩落法开采的矿山开采效果有较明显的影响。

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Deformation and failure law of the covered rock mass in the close laneways and the calculating of rock pillar load among laneways become one of the hot topics in the field of underground engineering.

近距离巷道群围岩的变形破坏规律和巷间岩柱荷载计算成为地下工程界十分关注的热点课题之一。

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Furthermore, the designs were covered with "desert varnish", a glaze that develops on rock surfaces over thousands of years of exposure to the elements.

此外，这些设计还覆盖有“沙漠清漆”，一种在岩石表面经过数千年在这些元素暴露下而形成的釉料。

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By the time we hit the West Coast, the Conan was covered in the rock 'n' roll stickers, from Meat Puppets to Killdozer.

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In one downstairs, there's a hidden toilet area, lighted with an Ingo Maurer winged bulb, as well as a vast shower and bath space, complete with rock-covered walls.

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According to local lore, the soot-covered depressions in a vertical rock face were used as cooking vessels by Indians.

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