threefold symmetry

• 三重对称

threefold symmetry的用法和样例：

例句

1. Zero dispersion point adjusted by structural parameters of TIR-PCF with sixfold rotation symmetry is studied numerically with a multipole method.
   摘要用多极方法数值研究构成六重对称全内反射型光子晶体光纤各种结构参数对基模零色散点的调节。