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.
I think the best thing you can do is to be grateful for what you have.
技术将重新定义能源的未来，我们必须引领这一变革。
Every day is a new opportunity to change your life.
The universe is full of surprises, and we are just beginning to scratch the surface of understanding it.
The Neanderthals are not extinct; they live on in us.