The plan called for pumping combustion byproducts from the plant underground.

该计划要求将工厂燃烧的副产品导入地下。

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The monitoring on underground coal bed combustion relied on drilling supervising in the past, but this method is not good.

对地下煤层燃烧过去一直依靠钻孔进行监测，未有有效的监测方法。

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Internal combustion engines used in machinery for underground works have been removed. They are not machinery, but partly completed machinery.

用于地下工作的机器里的内燃机已经删除了。它们不是机器，而是完整机械的一部分。

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The concept of heating underground coal to a combustion point may lead one to recall Centralia, PA, an abandoned town in Pennsylvania sitting on a coal seam which has been burning for 50 years, but the UCG controlled process makes that outcome highly unlikely.

FORBES: Underground Coal Gasification: A Trend Worth Watching