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。
The concept of NP-completeness has provided a powerful tool for understanding the complexity of problems.
I've always been fascinated by the idea of creating worlds that don't exist.
The pursuit of mathematical knowledge is a journey that never ends, filled with endless curiosity and wonder.
The steel industry must adapt to the needs of the future.
当准备遇到机遇时，成功就会到来。
The first step in liquidating a people is to erase its memory. Destroy its books, its culture, its history. Then have somebody write new books, manufacture a new culture, invent a new history. Before long the nation will begin to forget what it is and what it was. The world around it will forget even faster.