Every breakthrough starts with a question, and every question is a step toward the unknown.

"The world is a book, and those who do not travel read only one page."

我不完美，但我值得。

"Love is scary: it changes; it can go away. That's the part of the risk."

"There are no hard distinctions between what is real and what is unreal, nor between what is true and what is false."

关系模型基于谓词逻辑和集合论，为数据库管理提供了坚实的数学基础。