Finally, it is pointed that physical interpretation based on the theory of spherical wave propagation is of more practical meaning.
最后，通过分析比较，指出基于球面波传播原理的物理解释更符合实际。
Sommerfeld's wave expansion theory demonstrates that a spherical wave can be expanded as the superposition of plane simple harmonic waves.
索末菲关于波的展开理论证明，球面波可以展开为平面简谐波的叠加。
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