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.

声音既是亲密的，又是建筑性的。

Where they have burned books, they will end in burning human beings.

We are all just passing through, ephemeral, and yet we leave behind traces of our existence.

释义：脸上没有愤怒的表情是对他人的尊重，嘴里不说愤怒的话会散发出美好的气息。心中没有愤怒是无价的宝藏，这种心态是永恒不变的真理。