In other words, The Hermiticity of a matrix is invariant under unitary transformations.

换言之，矩阵的厄密性在幺正换下保持。

But diffeomorphism invariant theory leaves some problems to be explained, and the meanings of spacetime and physical theory are still in question.

但微分同胚理论存在需要解释的问题，空时及物理理论的意义仍明确。