国际体系本质上是竞争性的，国家不断试图互相超越。

I think it is in the nature of poetry to be always hinting at something beyond what is actually said.

成功是日复一日微小努力的总和。

The beauty of mathematics lies in its ability to simplify complex phenomena.

科学最令人兴奋的方面是发现一些新的东西，一些以前没有人见过的东西。