大学物理: there is no gravitational force, it is the curvature
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送交者: steven 于 2009-10-29, 12:30:50:
回答: 我高中学的时候就是这样理解的 由 qtl 于 2009-10-29, 09:05:33:
of spacetime, and when mass travel through it, the mass follows the least energy path.
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