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单词 longwall
释义

WordReference Random House Unabridged Dictionary of American English © 2024
long•wall  (lôngwôl′, long-),USA pronunciation adj. [Mining.]
  1. Miningnoting 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. 
  1. Miningthe continuous face so worked.
  • long1 + wall 1830–40

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