air door
Mining
noun
A door in a mine, normally kept closed, which separates an intake airway from a return airway.
Origin
Mid 19th century; earliest use found in Journal of the Royal Statistical Society.
| 单词 | air door |
| 释义 | air doorMining noun A door in a mine, normally kept closed, which separates an intake airway from a return airway. Origin |
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