| 单词 | fly-door |
| 释义 | > as lemmasfly-door fly-door n. Mining a door opening either way. ΚΠ 1849 G. C. Greenwell Gloss. Terms Coal Trade Northumberland & Durham 24 Fly doors, or swing doors,..constructed as always to fall close when left alone, but to open either towards or from the current of air. < as lemmas |
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