elliptic point

例句：

1. 1. Theellipse is the shape of acircle with one long axis and one shortaxis.
   椭圆是具有一个长轴和一个短轴的圆形形状。
2. 2. Theellipse is usedto describe the shape of theEarth's surface.
   椭圆用来描述地球表面的形态。
3. 3. The ellipse isalso used to calculate the distance between twopoints on the sphere.
   椭圆还用于计算球面上两点之间的距离。