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单词 under-level
释义 ˈunder-ˌlevel
[under-2.]
(See quots.)
1852Eng. & Foreign Mining Terms (1860) 66 Underlevel drift, a drift driven from the pumping-pit to un-water dip workings.1883Gresley Gloss. Coal-m. 267 Under-level, winning the ironstone by driving drifts into the hill-sides, &c., instead of sinking shafts.
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