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.

过去是一个异国他乡；他们在那里行事不同。

Forests are not just carbon sinks—they are life sources.

人心比万物都诡诈，坏到极处，谁能识透呢？

I do not wish them [women] to have power over men; but over themselves.