The concept of NP-completeness has provided a powerful tool for understanding the complexity of problems.
NP完全性的概念为理解问题的复杂性提供了一个强大的工具。
If everything was perfect, you would never learn and you would never grow.
记忆是一件复杂的事情,是真理的亲戚,但不是它的双胞胎。
"Justice is not always black and white; sometimes it's a shade of grey."