| 单词 | guide seam |
| 释义 | > as lemmasguide seam guide seam n. Coal Mining (see quot. 1867). ΘΚΠ the world > the earth > minerals > mineral deposits > [noun] > stratum or bed > of coal > type of coal seam foot coal1665 foot-rid1665 top coal1803 ten-yard coal1839 rider1840 ten-foot coal1855 top-hard1855 yard-coal1855 yard-seam1862 guide seam1867 main1867 bank1881 rearer1883 thick coal1883 thick seam1883 thin seam1883 1867 W. W. Smyth Treat. Coal & Coal-mining 79 There are here no less than 117 seams..of coal..They are now recognised and mapped over the entire district by the aid of three or four guide-seams of special character and persistence. < as lemmas |
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