| 单词 | air crossing |
| 释义 | > as lemmasair crossing air crossing n. Mining a structure for carrying one airway over another in a mine. ΘΚΠ society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > passage > ventilation passages or openings > bridge carrying air crossing1848 overcast1867 the world > matter > gas > air > fresh air > [noun] > supplying fresh air or ventilation > ventilator > passage, shaft, duct, or pipe > carrying one air-way over another in mine air crossing1848 1848 Eng. & Foreign Mining Gloss. 115 Air-crossing, an arch built over a horseway or other road, with a passage or air-way above it. 1911 Act 1 & 2 George V c. 50 §42 (3) All air-crossings shall..be so constructed as not to be liable to be destroyed in the event of an explosion. 1993 Mining Mag. (Nexis) Apr. 201 Sprayed concrete, generally known as ‘shotcrete’, is used in underground mines..to seal ventilation door surrounds and air crossings. < as lemmas |
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