圆球变扁后，极轴方向的半径小于赤道方向的半径，此时的形状即为扁球。
建立了正弦波纹扁球壳的非线性强迫振动微分方程；
The differential equations of nonlinear vibration of the shell were obtained.
本文利用边界元方法分析了变厚度扁球壳的非线性问题。
In this paper, we analyse the shallow spherical shells with variable thickness by the boundary element method.
他证明地球不是一个真的球而是一个扁球，而且计算了扁平度。
He shows that the earth is not a true sphere but an oblate spheroid and calculates the flattering.
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