The concept of NP-completeness has provided a powerful tool for understanding the complexity of problems.
自由市场最重要的一个核心事实是,除非双方都受益,否则交易不会发生。
我放弃了战斗:让我有个结局,有个隐秘的角落。我想被遗忘,甚至被上帝遗忘。
I wonder how many people I've looked at all my life and never seen.