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.
The strength of a company lies in its people; invest in them, and they will build the future.
La verdadera literatura no tiene fronteras, ni geográficas ni temporales.
驴子想的是一样，赶驴的人想的却是另一样。
Writing is a way of being in the world, a way of understanding it and making it understandable to others.