| 单词 | triad axis | 
| 释义 | > as lemmastriad axis  i.  Crystallography.  triad axis, an axis of trigonal symmetry. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystal symmetry > 			[noun]		 > axis of symmetry > types of screw axis1843 twin-axis1855 triad axis1909 1909    in  Cent. Dict. Suppl.  				 < as lemmas | 
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