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单词
underhole
释义
underhole
underhole
[
′ən·dər‚hōl
]
(mining engineering)
To mine out a portion of the bottom of a seam, by pick or powder, thus leaving the top unsupported and ready to be blown down by shots, broken down by wedges, or mined with a pick or bar.
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更新时间:2025/2/28 20:35:10