NP中的每个问题都可以归约为可满足性问题，这是计算复杂性理论的基石。
Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.
"You yourself, as much as anybody in the entire universe, deserve your love and affection."
The past is the past, and that’s where it belongs.
Data is the new oil, but unlike oil, it’s not a finite resource.
永远不要让年龄成为学习或发现的障碍。