Mining. Usually in form air-head. A horizontal passage constructed in order to carry air to part of a mine. Now rare.
| 单词 | θ75184 |
| 释义 | the world > matter > gas > air > fresh air > [noun] > supplying fresh air or ventilation > ventilator > passage, shaft, duct, or pipe > underground (1) airhead1817 Mining. Usually in form air-head. A horizontal passage constructed in order to carry air to part of a mine. Now rare. |
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