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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
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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