几何规定旋转对称只能以二次，三次，四次和六次存在。

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

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然而几何学告诉我们，只有二次、三次、四次和六次的旋转对称是能够存在的形式。

That is impossible. Geometry dictates that only two-, three-, four- and sixfold rotational symmetry can exist.

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本文用四次方程代替常用的几个二次方程曲线的回转体，来描述对称裂交的大形变过程。

In the paper, large deformation of symmetry fission has been described by a biquadratic surface revolution instead of several quadratic equations.

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