| 单词 | longwall |
| 释义 | longwall /lawng"wawl', long"-/, adj. Mining. 1. 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. 2. the continuous face so worked. [1830-40; LONG1 + WALL] |
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