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单词 bort
释义 bort
 —borty,  adj.  
 /bawrt/,  n.  
 low-quality diamond, in granular aggregate or small fragments, valuable only in crushed or powdered form, esp. for industrial use as an abrasive.
 Also, boart, bortz /bawrts/. Cf. ballas, carbonado2.
 [1615-25; appar. metathetic var. of *brot (OE gebrot fragment); akin to ME brotel brittle, ON brot fragment]
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