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

逻辑学研究不仅仅是关于推理规则，而是关于理性思维的结构。

可持续增长的关键是不断改进并适应变化的环境。

Change your life today. Don't gamble on the future, act now, without delay.

我认为你永远不必为自己的热情道歉。仅仅因为某些事情是老生常谈，并不意味着它不棒。