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 sea is history.

We are all just trying to find our way in the dark.

Architecture is the learned game, correct and magnificent, of forms assembled in the light.

我认为生活中最重要的事情就是快乐。

读书人如果不树立良好的品德，必定写不出好文章。

靠做好人是到不了顶峰的。

每个词都是通向理解的一步，但也是通向困惑的一步。

辩论的艺术是使较差的理由显得更好的艺术。

The poor are often more entrepreneurial than the rich, but they lack the tools to succeed.

Reason is the cold sun, it gives light but no warmth.