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.
"Literature is the mirror of society, reflecting its beauty and its ugliness, its hopes and its fears."
语言是存在的家。
勇于竞争
爱惜精神以备日后担当大任，虚度时光何以报父母之恩？