States are rational actors that seek to maximize their power and security in an anarchic international system.

最伟大的领导者不一定是做最伟大事情的人，而是能让人们去做最伟大事情的人。

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

The sculptor must search with passionate intensity for the hidden significance of life.

数学不是关于数字、方程、计算或算法：它是关于理解的。