intransitive. Mining. Of a vein of ore or coal: to contract, to become narrowed by convergence of the enclosing rock beds (often with in or down)…
| 单词 | θ6305 |
| 释义 | the world > the earth > minerals > mineral deposits > features of stratum or vein > [verb (intransitive)] > contract (2) twitch1704 intransitive. Mining. Of a vein of ore or coal: to contract, to become narrowed by convergence of the enclosing rock beds (often with in or down)… pinch1867 intransitive. Mining and Geology. Of a vein or deposit of ore, or a stratum: to contract in volume, to become gradually thinner; to pinch out: to… |
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