三下采煤是建筑物下、铁路下和水体下采煤方法的统称。
... three unbalanced power ==> 三相不平衡功率 three unders in coal mining ==> 三下采煤 three unique catalytic converter ==> 三元催化净化器 ...
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“三下”采煤的安全问题是长期以来在采矿中值得注意的问题，它关系到矿井作业的安全和经济效益问题。
Mining under the village , the railway and the water is a problem in mining, which is related to the safety and the economic benefit in every coal pit.
覆岩破坏规律探测是“三下”采煤，尤其是水体下采煤不可缺少的部分。
It is indispensability of overburden failure law for mining under buildings, water bodies and railways, especially mining under water bodies.
条带开采作为“三下”采煤的主要技术措施之一，在我国煤矿区被广泛采用。
The strip mining as one of the main technical measures for coal mining operation under buildings, railways and water bodies has been widely applied to coal mines in China.
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