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

To understand a sentence means to understand a language.

伤口是光进入你身体的地方。

优秀的数学家不是知道所有答案的人，而是能提出正确问题的人。

You know some birds are not meant to be caged,their feather are just too bright.

建筑是关于创造场所，而不仅仅是建筑物。

一个精心设计的空间可以改变人们的生活和互动方式。