| 单词 | top rock | 
| 释义 | > as lemmastop rock   top rock  n. Coal Mining the uppermost stratum of (hard) rock.ⓘ ΘΚΠ the world > the earth > minerals > mineral deposits > features of stratum or vein > 			[noun]		 > material above > above coal roof1575 wark1707 top rock1803 wash1882 1803    J. Plymley Gen. View Agric. Shropshire 56  				Top-rock 7 yds. 0 ft. 0 in. 1879    G. F. Jackson Shropshire Word-bk. at Coal-field  				Soil,..Clay,..Loose Rock,..Coal,..Blue Clod,..Red Clunch,..Top Rock,..White Clod,..Brown Clunch. < as lemmas | 
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