| 单词 | symmetry operation of the second kind | 
| 释义 | symmetry operation of the second kind [¦sim·ǝ·trē ´äp·ǝ´rā·shǝn ǝv thǝ `sek·ǝnd ´kīnd]  CRYSTALLOGRAPHY A combination of rotations, reflections, and translations that brings a crystal into a position that is a mirror image of its original position.  | 
	
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