生活是为了活着，我们都知道。

每个角色都有一个故事，每个故事都有一个角色。

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

Our descendants will achieve things that will amaze us， yet a portion of what they will create could have been made with today’s materials and tools if we had had the imagination. Think bigger.

The past is never dead. It's not even past.

All things are possible until they are proved impossible and even the impossible may only be so, as of now.