room-and-pillar coal face刀柱工作面

artificial room-and-pillar mining人工壁柱房柱法

room-and-pillar stoping房柱采矿法

room-and-pillar mining method房柱采矿法

triple-heading room-and-pillar mining三平巷房柱采矿法

triple-entry room-and-pillar mining三进路房柱式采矿法

Sublevel Medium-long room-and-pillar mining中深孔分段矿房法

Room-and-pillar mining with overcut切顶房柱法

high-face room-and-pillar mining高工作面房柱式开采