ellipsoids

所有横截面均为椭圆或圆形(包括球面)的曲面,是椭圆的推广,在笛卡尔坐标 (x, y, z) 中,方程为 x2/a2 + y2/b2 + z2/c2 = 1 的二次曲面。

A surface, all of whose cross sections are elliptic or circular (including the sphere), that generalises the ellipse and in Cartesian coordinates (x, y, z) is a quadric with equation x2/a2 + y2/b2 + z2/c2 = 1.

用于模拟地球形状的椭球面。

Such a surface used as a model of the shape of the earth.