That is, according to the atoms of solid structure have or haven′t periodicarrangement, crystal can be classified to single unit cell crystal and double unit cell crystal.
按照晶体结构中原子是否有周期性重复排列将晶体分成了单胞晶和双胞晶两大类。
2
Although the arrangement of the professional football training construct is based on the periodic theory, it's focus is arranged according to the football tournament.
足球训练结构的安排，虽仍以周期性理论为依据，但围绕联赛安排训练是当今职业足球训练的核心。
3
On either side of the discontinuity, the gap discontinuities with the same structure are inserted at equal spacing so that periodic discontinuity arrangement is constructed.