... spherical-earth factor ==> 球形地面因数 spherical-harmonic expansion ==> 球谐函数展开 spherically dished cover plate ==> 球面碟形盖板 ...
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Representing velocities by spherical harmonic expansion on the sphere after transformation can greatly reduce the number of spherical harmonic coefficients needed.
在变换后的球面域上用球谐函数来拟合速度函数，达到降低球谐系数阶数的目的。
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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