这是很好的练习，在柱坐标下再算一次，看看结果一不一样。
A good exercise: do it in cylindrical and see if you get the same thing.
层状压电压磁弹性材料的空间轴对称问题：在柱坐标下，建立了横观各向同性压电压磁弹性材料空间轴对称问题的状态变量方程。
Axisymmetric problem: The state vector equation of transversely isotropic axisymmetric space magneto-electro-elastic media is established in a cylindrical coordinate system.
在柱坐标下从微分波动方程出发，推导柱面光波的场分布，并利用远场近似条件导出当线光源与光轴成任意角度时，在垂直光轴方向的参考面上的复振幅表示。
The expression of complex amplitude is given in reference plane vertical to the optical axis by far-field approximation when the line source and the principal axis are at any Angle.
在柱坐标下从微分波动方程出发，推导柱面光波的场分布，并利用远场近似条件导出当线光源与光轴成任意角度时，在垂直光轴方向的参考面上的复振幅表示。
Starting from the wave differential equation, a method is deduced to express the complex amplitude of light wave fields in the reference plane which is vertical to the optical axis.
在柱坐标下从微分波动方程出发，推导柱面光波的场分布，并利用远场近似条件导出当线光源与光轴成任意角度时，在垂直光轴方向的参考面上的复振幅表示。
Starting from the wave differential equation, a method is deduced to express the complex amplitude of light wave fields in the reference plane which is vertical to the optical axis.
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