唯一能替代一件艺术品的，是另一件艺术品。
The only thing that can replace a work of art is another work of art.
It's not about how hard you hit. It's about how hard you can get hit and keep moving forward.
最优财政政策要求税率随时间平稳变化，仅对政府支出的永久性变化作出反应。