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.
建筑应与周围环境产生共鸣，反映其所在地区的文化和历史。
The art of leather crafting is a dialogue between the past and the future.
Illness is the night-side of life, a more onerous citizenship. Everyone who is born holds dual citizenship, in the kingdom of the well and in the kingdom of the sick.
教育不仅仅是往头脑里填塞事实，而是点燃好奇心和批判性思维的火花。
程序测试可以用来显示错误的存在，但绝不能显示它们的不存在！