The P versus NP problem is one of the most important unsolved problems in computer science.

The key to fighting poverty is to break it down into smaller, more manageable problems.

世界上充满了显而易见的事物，但没有人会去注意它们。

The Langlands program is a challenge to the boundaries of mathematical knowledge.

社会正义的首要组成部分是全人类都有足够的食物。