effective indices的用法和样例：
例句
- Combining the modified effective index method, a novel method for calculating the complex reflection spectrum is proposed.
结合改进的有效折射率分析方法，提出了一种计算光纤光栅谱特性的新方法。 - The result obtained by the vectorial effective index method is in better agreement with those by the finite element methods and measured data.
采用矢量有效折射率方法的计算结果与基于有限元方法求解的数值结果和测量结果吻合得更好。
