Tetragonal enantiomorphic hemihedral class Liquid water can assume only a single symmetrical shape. 液态水只能有一种对称形状。
Enantiomorphic phase ambiguities and the modified component relation& the application of direct methods to protein structures 对映相位双解和变型分量关系式&直接法在测定蛋白质晶体结构中的应用