NP完全性的概念为理解计算问题的复杂性提供了一个强大的工具。

"Die Vergangenheit ist nie tot, sie ist nicht einmal vergangen."

"Life is a series of natural and spontaneous changes. Don't resist them; that only creates sorrow. Let reality be reality. Let things flow naturally forward in whatever way they like."

The truth is rarely pure and never simple.

跨国合作对解决全球粮食问题至关重要。