- two-fold rotation axis
- двойная ось симметрии (ось симметрии кристалла, вращение вокруг которой на 360° дважды заменяет каждый элемент кристалла эквивалентным элементом) и
Англо-русский словарь промышленной и научной лексики. 2014.
two-fold rotation axis
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