Adaptation is the mind's greatest achievement.
适应是心智最伟大的成就。
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。
Your voice is your power, never let anyone silence it.
The future of democracy depends on its ability to adapt to new challenges and to renew itself.
Anyone who isn't embarrassed of who they were last year probably isn't learning enough.
The pursuit of mathematical knowledge is a journey that never ends; there is always more to discover and understand.