| 单词 | symmetry element | 
| 释义 | symmetry element [`sim·ǝ´trē ´el·ǝ·mǝnt]  CRYSTALLOGRAPHY 1. Some combination of rotations and reflections and translations which brings a crystal into a position that cannot be distinguished from its original position. Also known as symmetry operation; symmetry transformation.  2. The rotational axes, mirror planes, and center of symmetry characteristic of a given crystal.  | 
	
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