We can get the size of same order elements if we put some different conjugacy classes with the same order elements together, then we will get order equation of a finite group.
如果先把互不共轭的同阶元的共轭类长合并得到同阶类长，再把同阶类长相加就得到了阶方程。
A typical structural model and a coupled equation group of a one-order Raman fiber optical laser using P-doped optical fiber as its gain medium are presented.
介绍了以掺磷光纤为增益介质的一阶喇曼光纤激光器的一般结构模型和耦合方程组。
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