下部煤层 meaning in Chinese
anderseam
underlying seam
Examples
- Study of dynamic control technology over surrounding rocks in main roadways with the underlying coal seams mined
下部煤层跨采大巷围岩动态控制技术研究 - Abstract : the chengzhuang coal mine is threatened by the underground water when the strata is mined
文摘:成庄井田为新建矿井，下部煤层开采受地下水的威胁。