多项式时间归约的概念对于理解NP完全问题的结构至关重要。
The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.
是个正常人都喜欢钱财，但要用正当的手段去求取；无论是男性还是女性都希望自己帅气和美丽，这是人之常情，但也要有礼仪规范。
The most sustainable building is one that people love enough to maintain for generations.
"The future of physics lies not in discovering new particles, but in understanding the deeper principles that govern the behavior of the particles we already know."
历史上的重大战争——我们有幸经历了最伟大的一场——是国家间不平衡增长的直接或间接结果。