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room-and-pillar
释义
WordReference Random House Unabridged Dictionary of American English © 2024
room-and-pil•lar
(ro̅o̅m
′
ən pil
′
ər, rŏŏm
′
-),
USA pronunciation
adj.
[
Mining.
]
Mining
noting 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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更新时间:2026/7/27 4:41:22