Bispherical coordinates
- 双球坐标系（双球坐标系是一种三维正交坐标系。设定二维双极坐标系包含于xz-平面。将双极坐标系绕着z-轴旋转，则可以得到双球坐标系）
Bispherical coordinates
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abstract:
bipolar coordinate system about the axis joining its two foci. The foci are located at distance 1 from the vertical z-axis.
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WordNet
