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。

Standards are the key to the success of the Internet.

The ability to imagine counterfactuals is what distinguishes humans from machines.

Drawing is honesty. There is no possibility of cheating. It is either good or bad.

每个故事都有一个开始，但并非每个故事都有一个结局。