The best time to sell a stock is almost never.
卖出股票的最佳时机几乎永远不会到来。
The best weapon of a dictatorship is secrecy, but the best weapon of a democracy should be the weapon of openness.
In times of crisis, transparency and accountability are paramount.
学习数学的最好方法就是做数学。
去做高尚的事情，不要整天只是做梦。
To understand the electron is to understand the foundation of our technological civilization.
死者通过我们说话，在我们的梦中，在我们的文字里。