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单词
pillar-and-room system
释义
pillar-and-room system
pillar-and-room system
[
′pil·ər ən ′rüm ‚sis·təm
]
(mining engineering)
A system of mining whereby solid blocks of coal are left on either side of working places to support the roof until first-mining has been completed, when the pillar coal is then recovered.
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更新时间:2025/3/17 15:43:41