| 单词 | head coal | 
| 释义 | > as lemmashead coal   head coal  n. Mining the uppermost portion of a thick seam of coal, esp. when left unworked for the present. ΚΠ 1830    Edinb. Encycl. XIV. 355/2  				The head coals are brought regularly down in large tabular masses, of such thickness as suits best with the free partings. 1883    W. S. Gresley Gloss. Terms Coal Mining  				Head-coal (S[cotland]), the upper portion of a thick seam of coal which is worked in two or more lifts. 2002    R. Armstead  & S. L. Gardner Black Days, Black Dust 		(2003)	 xiv. 118  				As he moved in, the head coal fell down over the loading machine. A chunk of coal snapped out of the top and hit the loader on the head. < as lemmas | 
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