| 单词 | dumb-drift |
| 释义 | > as lemmasdumb-drift dumb-drift n. an airway conveying foul air to the upcast shaft of a mine, past and not through the ventilating furnace, called when so arranged a dumb-furnace n. ΚΠ 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 129 Dumb-drift, an air-way conveying air around, not through, a ventilating furnace to the upcast. < as lemmas |
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