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.
生活是一系列的时刻，每一个都是一个等待被讲述的故事。
不要在干草堆里找针。直接买下整个干草堆！
The measure of a man is what he does with power.
自行车是我的生命。我骑它上班，骑它娱乐，骑它比赛，骑它活下去。
Don't wait until everything is just right. It will never be perfect. There will always be challenges, obstacles and less than perfect conditions. So what. Get started now. With each step you take, you will grow stronger and stronger, more and more skilled, more and more self-confident and more and more successful.
