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.
真相是,生活既美妙又可怕,既迷人又恐怖,既甜蜜又苦澀,這就是一切。
The greatest art is noisy with ideas.