The concept of NP-completeness has provided a powerful tool for understanding the complexity of problems.

出门时笑一笑，不要心怀悲哀，广阔的胸怀处处都能敞开。

I always say, decisions I make, I live with them. There's always ways you can correct them or ways you can do them better. At the end of the day, I live with them.

你读得越多，知道的事情就越多。你学得越多，能去的地方就越多。

心理学应帮助我们理解如何应对生活的挑战。

The dead are not silent. They are merely waiting to be heard.