translation.en: And now string theory comes along and says, yes, gravity, quantum mechanics, electromagnetism, all together in one package, but only if the universe has more dimensions than the ones that we see.
translation.zh: 现在弦理论出现并告诉我们 对，重力，量子力学，电磁力学 都可以被统一起来 但前提是我们的宇宙拥有更多的维度，多过我们能观察到的