孩子们只有对自己发明的东西才有真正的理解,每当我们试图太快地教他们一些东西时,我们就阻止了他们自己去重新发明它。
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.