The concept of NP-completeness has provided a powerful tool for understanding the complexity of computational problems.

企业的成功，不是偶然的，而是必然的。

"You can’t just give up on someone because the situation’s not ideal."

Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible.

The city is like a great palimpsest, a manuscript that has been written and rewritten over the centuries.