1. The planet's motion around the star can be accurately described by a Keplerian orbit.
(该行星围绕星体的运动可以精确地用开普勒椭圆轨道来描述。)
2. The satellite follows a Keplerian trajectory as it orbits around the Earth.
(卫星在绕地球运行时遵循着开普勒椭圆轨道。)
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