英漢例句雙語例句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(yùn)行,太陽位於橢圓的一個焦點(diǎn)上。 對任一個行星說,它的逕矢在相等的時間內(nèi)掃過相等的麪積。kepler's law of planetary motion更多例句詞組短語短語Kepler 's law of planetary motion 開普勒行星運(yùn)動定律kepler's law of planetary motion更多詞組