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单词
mining retreating
释义
mining retreating
mining retreating
[
′mīn·iŋ rē′trēd·iŋ
]
(mining engineering)
A process of mining by which the ore or coal is untouched until after all the gangways and such are driven, at which time the work of extraction begins at the boundary and progresses toward the shaft.
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更新时间:2025/3/17 9:56:07