名词
中文翻译：Unknown
同义词：
['开普勒定律，开普勒第一定律，开普勒第二定律，开普勒第三定律']
例句：
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1. The Kepler's law states that the orbit of a planet is elliptical, not circular.
开普勒定律指出行星的轨道是椭圆形的，不是圆形的。
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2. According to Kepler's law, the farther from the Sun a planet is, the smaller its orbital period willbe.
根据开普勒定律，一个行星离太阳越远，它的轨道周期就越小。
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3. Kepler's law also explains why some planets are closer to their parent star thanothers.
开普勒定律还解释了为什么有些行星比它们的母星更接近。