And we have one theory, m theory or string theory, suggests that the constants of nature are pegged to fields that can vary across space in time.
我们有一个理论，M理论或弦理论，认为自然界的常数，是钉在“场”里的，它们随时间和空间而变化。
There were competing string theories, and a breakthrough finally came when it was realized that all were manifestations of an underlying theory called m theory.
曾经有很多相互竞争的弦论理论。最终得到突破的时候是大家意识到，这些理论不过是一个更一般的叫做M理论的东西在各种特殊情况下得特例。
General Relativity; Quantum Gravity; String Theory and M-Theory.
广义相对论；量子引力；弦论和M -理论。
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