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

未来属于那些敢于相信不可能的人。

What I remember above all about Harvard was being in the midst of so much energy and intelligence. It could be exhilarating, intimidating, sometimes even discouraging, but always challenging. It was an amazing privilege…and though I left early, I was transformed by my years at Harvard, the friendships I made, and the ideas I worked on.