| 单词 | roofing slate | 
| 释义 | > as lemmasroofing slate   roofing slate  n. ΚΠ 1794    J. Miller Synopsis Mineral. f. 3 		(table)	  				Roofing slate. 1833    Penny Cycl. I. 406/1  				It is as hard as roofing slate. 1995    A. M. Cvancara Field Man. Amateur Geologist 		(rev. ed.)	 xxii. 278  				Dimension stone may be classified according to its use as building stone..roofing slate, and millstock slate. < as lemmas | 
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