| 单词 |
level-free |
| 释义 |
ˈlevel-free, a. Of a mine: Admitting of being worked or drained by means of a level or levels.
1805R. Forsyth Beauties Scotl. III. 411 The mine..is nearly 700 feet above the level of the valley, and must therefore always be level-free. 1883Gresley Gloss. Coal-Mining, Level-free, old coal or ironstone workings at the outcrop, worked by means of a day level driven into the hillside. |

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