里氏替换原则是面向对象编程中的一个基本概念，确保派生类可以替代其基类使用，而不会改变程序的正确性。

The story is not in the plot; the plot is in the story.

The beauty of science lies in its ability to explain the natural world through observation and experimentation.

Seduction is always more singular and sublime than sex and it commands the higher price.

"The face of Russia is reflected in the eyes of its people."

A good abstraction is one that emphasizes the essential and suppresses the irrelevant.

我们甚至不知道自己有多强大，直到我们被迫将那种隐藏的力量展现出来。在悲剧、战争、需要的时刻，人们会做出惊人的事情。人类生存和更新的能力是惊人的。