States are rational actors that seek to maximize their relative power in order to ensure their survival in a competitive international system.

I don't think that everyone should become a mathematician, but I do believe that many students don't give mathematics a real chance.

我在很早之前就决定要无条件接受生活。我从来没有期望任何特别的事情发生，但我获得的总远远超过我的期望。但大部分时候，发生在我身上的事我都没有刻意追寻。

Challenges are opportunities in disguise; embrace them and grow stronger.