The Liskov Substitution Principle is a fundamental concept in object-oriented programming, stating that objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.

放下包袱，继续前进。

The most important actions are never comfortable.

In a time of universal deceit - telling the truth is a revolutionary act.

未来是创造一个更具包容性的世界。

市场是一个概率游戏。