Nowadays, if you go to outer space, you can check for yourself that if you throw something out, it just goes on forever without your intervention.
现如今,如果你去了外太空,你可以向外抛个物体试试,如果你不打断它,它就会一直运动下去
耶鲁公开课 - 基础物理课程节选
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模块上移
模块下移
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