解释：曲子高妙，不是人人都能和唱；说出真相，不是人人都能相信。

The holographic principle suggests that the information content of a region of space can be thought of as encoded on the boundary of that region.

"Reality is not what happens to us, but what we make of what happens to us."

数学中最重要的是理解概念，而不仅仅是记忆公式。