| 单词 | ground-crab |
| 释义 | > as lemmasground-crab ground-crab n. a kind of hoisting-apparatus used in mining (see quot.). ΚΠ 1849 G. C. Greenwell Gloss. Terms Coal Trade Northumberland & Durham 17 Ground crabs are used in sinking, for lowering the sinking set of pumps as the pit is deepened. < as lemmas |
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