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单词 room-and-pillar
释义

WordReference Random House Unabridged Dictionary of American English © 2024
room-and-pil•lar  (ro̅o̅mən pilər, rŏŏm-),USA pronunciation adj. [Mining.]
  1. Miningnoting a means of extracting coal or other minerals from underground deposits by first cutting out rooms, then robbing the pillars between them;
    pillar-and-breast. Cf. longwall. 

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