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

我们写作不是为了被理解，而是为了理解。

黑洞不仅仅是破坏性的怪物，它们在塑造星系中起着关键作用。

能源的未来在于多样化和适应性。

It's waiting that helps you as an investor and a lot of people just can't stand to wait.If you didn't get the deferred -gratification gene, you've got to work very hard to overcome that.

人似乎分为好人和坏人。好人睡得好一些，而坏人似乎能更好地享受醒着的时间。