Geometry dictates that only two -, three -, four - and six-fold rotational symmetry can exist.

几何规定旋转对称只能以二次，三次，四次和六次存在。

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Geometry dictates that only two -, three -, four - and six-fold rotational symmetry can exist.

几何规定旋转对称只能以二次，三次，四次和六次存在。

youdao