短語詞組短語Three pillar extraction panels 三大支柱提取板;三個支柱提取面板;三個柱子提取盤區(qū);三個支柱開采板partial pillar extraction 部分支柱提取;部份柱子提取shaft pillar extraction 井筒煤柱開采bottom pillar extraction 底柱回采Ore pillar extraction 礦柱回采pillar extraction drilling 煤柱回采鉆眼pillar extraction methods 支柱提取方法cap pillar extraction 頂柱回采The mine commenced pillar extraction 該礦展開支柱提取;礦井展開支柱提取;排雷的支柱開始提取;礦開始的柱子提取 返回 pillar extraction