kepler's law of planetary motion
常见例句
- The Laws of Planetary Motion Kepler's First Law: The orbits of the planets are ellipses, with the Sun at one focus of the ellipse.
行星沿椭圆轨道绕太阳运行，太阳位于椭圆的一个焦点上。 对任一个行星说，它的径矢在相等的时间内扫过相等的面积。 返回 kepler's law of planetary motion