What's behind the answer is the principle of relativity: Fundamental physical observables are the same in any frame of reference, however it's moving.
这个答案的背后下是相对论的原则：无论一个参照系如何移动，其中基本的物理观察都是相同的。
What's behind the answer is the principle of relativity: Fundamental physical observables are the same in any frame of reference, however it's moving.
这个答案的背后下是相对论的原则：无论一个参照系如何移动，其中基本的物理观察都是相同的。
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