“room-and-pillar”的概念、定义、翻译、参考文献-科学参考

单词	room-and-pillar
释义	room-and-pillar [`rüm ǝn `pil·ǝr] ^{MINING ENGINEERING} A system of mining in which the coal or ore is mined in rooms separated by narrow ribs or pillars; pillars are subsequently worked.
随便看	rimmed kettle rimmed solution pool rimmed steel rimming wall rimpylite rim ridge rimrock rimstone rim syncline rincon rind rinderpest R indicator ring ring A ring-and-ball test ring-and-bead sight ring-and-circle shear ring-around ring B ringbolt ring bus ring C ring canal ring circuit

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