As Kepler showed, the Earth's orbit is an ellipse, with the sun at one of the two focal points.

开普勒曾表明，地球的轨道是一个椭圆，这个椭圆有两个焦点，太阳在其中一个上。

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As Kepler showed, the Earth's orbit is an ellipse, with the sun at one of the two focal points.

开普勒曾表明，地球的轨道是一个椭圆，这个椭圆有两个焦点，太阳在其中一个上。

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