Happiness is a tranquil mind.

理论计算机科学的重要性在于它能够为实际应用提供基础。

I neither affirm nor deny， but I suspend my judgment.

The history of mathematics is a history of human thought and progress.

"A story is a letter that the author writes to himself, to tell himself things that he would be unable to discover otherwise."

现实总是比想象更离奇。