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

换言之，矩阵厄密性在幺正变换下保持不变。

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

但微分同胚不变理论存在需要解释问题，空时及物理理论意义仍不明确。