| 单词 | jet seam |
| 释义 | > as lemmasjet seam ΘΚΠ the world > the earth > minerals > mineral deposits > [noun] > stratum or bed > of coal > seam of specific coal singing coal1855 jet seam1873 1873 Jrnl. Soc. Arts 19 Dec. 85/1 The thinness of the jet seam generally prevents large objects from being made. 1891 Labour Commission Gloss. Jet Seam, a bed of Durham coal of a coarse cannel species, nearly approaching to a black shale. < as lemmas |
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