Keplerian ellipse

例句：

1. 1. The Keplerian ellipse is a mathematical model used todescribe the motion of planets.
   开普勒椭圆是一种数学模型，用于描述行星的运动。
2. 2. In theKeplerian ellipse, the distance between the two foci is equal to the sum of thesemi-major axis and the semi-minor axis.
   在开普勒椭圆中，两个焦点之间的距离等于半长轴和半短轴之和。
3. 3. The Keplerian ellipse is also usedin astronomy to calculate the orbits of celestial bodies.
   开普勒椭圆也在天文学中用于计算天体的运动轨道。