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。
That is impossible. Geometry dictates that only two-, three-, four- and sixfold rotational symmetry can exist.
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。
Acoording to the crystal symmetry, diffraction geometry and the diffraction laws, the complicated divergent beam X-ray diffraction has been studied.
根据晶体的对称性、衍射几何和衍射规律,研究了复杂的发散X射线晶体衍射。
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