| 单词 | coal seam |
| 释义 | > as lemmascoal seam coal seam n. a stratum of coal; cf. seam n.1 5. ΘΚΠ the world > the earth > minerals > mineral deposits > [noun] > stratum or bed > of coal coal bed1591 roach1653 coal measure1665 coal vein1665 main coal1708 coal seam1756 1756 M. Calderwood Lett. & Jrnls. (1884) vi. 183 The coal seams are of a vast thickness, and the coals very large. 1863 A. C. Ramsay Physical Geol. & Geogr. Great Brit. 136 Were it not for our coal-seams, the agency of steam would be almost wholly denied to us. 1932 H. V. Morton In Search of Wales xii. 248 The line of loaded coal ‘trams’ which travels, often for miles, from the coal seam to the pit bottom. 2001 High Country News 10 Sept. 2/3 To watch a $30 million longwall machine chew its way through a nine-foot-high coal seam. < as lemmas |
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