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to phrases
level drift
expl.
水平巷道
水平掘进的平硐。在地上,从某一工作场所开挖通向其他场所的通道。小断面的平硐称巷道,大断面的平硐叫水平大巷
tech.
横洞
;
水平坑道
level drift:
2 phrases
in 2 subjects
Electronics
1
Technology
1
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