光是所有存在的起源。

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。

All happy families are alike; each unhappy family is unhappy in its own way.

Though debts are condemned in the financial world, the world of friendship and love may perversely depend on well-managed debts.

Color is the keyboard, the eyes are the harmonies, the soul is the piano with many strings. The artist is the hand that plays, touching one key or another, to cause vibrations in the soul.

声音是一种非常接近灵魂的乐器。