The beauty of instrumental variables is that they allow us to see the world in a new light.
All men are immortal, but those who are not educated are immortal in a lower and less enviable sense.
当真相被埋葬时,它仍在生长,虽被压抑,却积聚着这样一种力量,一旦爆发,它将炸毁一切,灰飞烟灭。
一个人有身份有地位的时候朋友很多,但危难时候却没人与之交待。
Opportunity lies in the place where the complaints are.