The key link to obtain the evaluation parameters of coal reservoirs is the coal cores from coal-bed gas wells and the coal rock from coal reservoir outcrop.

煤层气井煤心和煤储层露头的煤岩类型系统测量是获取煤储层评价参数的关键环节。

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Remains of Titanoboa cerrejonensis were found in a layer of rock at the cerrejon Coal mine, one of the largest open-pit mines in the world.

Titanoboa cerrejonensis(蛇的名字)的遗骸是在cerrejon煤矿- - -世界上最大的露天煤矿之一的岩层中被发现的。

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He could sense the right place to hit so that the rock crust would cleave and reveal the coal, in the same way that a sculptor can sense exactly where to hammer a chisel into a stone.

他可以感觉到正确的敲击位置，这样岩石的外壳就会裂开显出煤矿，正如雕塑家可以精确知道在石头的什么位置而用凿子敲击一样。

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Murray said Thursday that if the miners survived the collapse, they could continue to live on fresh air, food and water supplied through the holes until crews can remove tons of coal and rock that clogged a collapsed tunnel.

CNN: Camera lowered into mine cavity shows 'survivable space'

There has been turbulence in businesses associated with coal as coal has lost its vigor lately as the preferred fuel option for electricity generation in the U.S. amid rock bottom natural gas prices.

FORBES: CSX Chugs To $25 Despite King Coal's Weakness