The challenge in theoretical computer science is not just to solve problems, but to understand the nature of problem-solving itself.

未来的无人机将像今天的智能手机一样普及。

Any change, even a change for the better, is always accompanied by drawbacks and discomforts.

It is silly not to hope, he thought.

The man who has begun to live more seriously within begins to live more simply without.

没有孩子的民族将面临无望的未来；没有树木的国家将面临更加无望的未来。