Sometimes the hardest thing and the right thing are the same.

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

Suspicion against every kind of authority grew out of this experience， an attitude which has never again left me.

环保是我们不可推卸的责任，在开采过程中必须注重生态保护，实现可持续发展。

一个理论的前提越简单，它关联的不同事物越多，其适用范围越广，这个理论就越令人印象深刻。