The city is the greatest architectural achievement of humanity.

书籍是时间的容器，它们保存着过去的思想和情感，供未来的读者探索。

"To live is the rarest thing in the world. Most people exist, that is all."

The greatest discoveries are often the result of many small steps.

密码学的目标是使破解系统的成本超过受保护信息的价值。