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在具体讨论之前,我们需要认可物理学中的一个基本公理,这就是:
宇宙中所有各处的物理规律都是一样的。 A14
这个公理意味着,无论是在哪一个惯性系,所用的物理学公式都应当是一样的。显然,无论是从哲学角度、还是从现实角度,这个公理都是无可挑剔的,否则我们生活的宇宙就太杂乱无章了。