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单词
long-pillar work
释义
long-pillar work
long-pillar work
[
′lȯŋ ¦pil·ər ‚wərk
]
(mining engineering)
A coal-winning technique used in underground mining in which large pillars of coal are left as the face is advanced; finally all the pillars are removed together.
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更新时间:2025/10/8 11:09:01