| 单词 | pack wall |
| 释义 | > as lemmaspack wall pack wall n. Coal Mining a pack (sense 10c) in the form of a wall. ΚΠ 1867 W. W. Smyth Treat. Coal & Coal-mining 125 It is found to be the better course to remove all the coal, and to trust to pack-walls. 1935 A. J. Cronin Stars look Down i. xxii. 207 [They] began to tub the water, to try and get rid of it by letting it through the pack walls on the low side of the drawing road. 1981 Coal (Nexis) Feb. 74 Upper lift is extracted first by using advancing longwall aided by pack walls and jacks to support roof. < as lemmas |
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