| 释义 |
bolthole
bolt·hole B0377200 (bōlt′hōl′)n.1. A hole through which to bolt: found a bolthole in the fencing.2. A place affording escape.bolthole
bolthole[′bōlt‚hōl] (mining engineering) A short, narrow opening made to connect the main working with the airhead or ventilating drift of a coal mine. Also known as bolt. |