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.
行星沿橢圓軌道繞太陽運行，太陽位於橢圓的一個焦點上。 對任一個行星說，它的逕矢在相等的時間內掃過相等的麪積。 返回 kepler's law of planetary motion