Deriving the smallest primitive unit cells, necessary to describe the translational periodicity of a crystal structure, is the first step toward choosing the correct space group.
2
作为一种流体，液晶蓝相能像晶体一样有三维空间群对称性，这引起了人们的广泛兴趣。
As a liquid, the blue phase shows the 3d-space group symmetry, just like crystals, which arouses people's interest.
3
导出反映晶体结构周期的最小素单胞是正确判断空间群的第一步，其中以还原单胞的选择最为理想。
Among these smallest cells, only the reduced cell is unique and useful in selection of a Bravais lattice.
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