In fact, the centre of mass for the Sun-Jupiter system is actually inside the Sun.

事实上，该中心的大规模的太阳木星系统实际上是在太阳。

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Discusses the dynamic theorem of mass system relative to centre of mass moving in a plane.

论述了质点系相对于随质心一起作平动的座标系的动力学规律。

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