"光速是極限"是在相對論的邊界内。

If you can develop a theory of physics in which the speed of light isn't the limit, it is OK too. But you need to find that theory and test it first. 

Relativity is truthful ("valid" is a better word. "Effective" is even better) only within its boundary. It is aware of the existence of its own boundary. 

不能没边兒地談有边兒的事情 .