里氏替换原则是面向对象编程中的一个基本概念，它指出子类的对象应该能够替换超类的对象而不影响程序的正确性。
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.
绘画的行为是一种臣服的行为。
制造业的未来在于自动化和人类工艺之间的平衡。
历史给我们的教训是，人们从来都不知道汲取历史的教训。
In mathematics, you don't understand things. You just get used to them.
We need to think about digital skills in the same way we think about literacy and numeracy.