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单词
room-and-pillar
释义
room-and-pillar
room-and-pillar
[
′rüm ən ′pil·ər
]
(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.
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更新时间:2025/3/16 19:53:20