发愤研究学问，常常忘记吃饭，一旦有所收获便又高兴地忘记了忧愁，连自己的渐趋衰老也没有感觉到。

Change is good.

A promise is a promise.

显微镜是永远不会说谎的沉默证人。

When a professor insists computer science is X but not Y, have compassion for his graduate students.

它是大地的泪点，使她的微笑保持着青春不谢。