因果推断的本质是超越数据，询问如果我们干预会发生什么。

守时是尊重的表现。

The greatest tragedy of humanity is not death, but the loss of dignity.

Democracy is the only system that can reflect the human spirit's indomitable will to be free.

The things that make us human are the things that make us vulnerable.

I'm not afraid of storms, for I'm learning how to sail my ship.

仅仅那山学会下一而是不够的，种大需里当上如有阳光、自由，和一点花的芬芳。