underground combustion的意思|示意

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。

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。

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。