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单词
longwall
释义
WordReference Random House Unabridged Dictionary of American English © 2024
long•wall
(lông
′
wôl′, long
′
-),
USA pronunciation
adj.
[
Mining.
]
Mining
noting or pertaining to a means of extracting coal or other minerals in an underground mine from a continuous face, the roof before the face being supported at intervals by temporary or movable artificial supports. Cf.
room-and-pillar.
n.
Mining
the continuous face so worked.
long
1
+
wall
1830–40
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更新时间:2025/7/23 11:45:46