To understand recursion, one must first understand recursion.
要理解递归，首先必须理解递归。
The only thing that can change the world is love.
The light is what guides you home, the warmth is what keeps you there.
The only way to do great work is to love what you do.
The key to sustainable growth is balancing short-term gains with long-term vision.
世界是一片伟大的天空，我们是其中的鸟儿。
我们都是等待被发掘的潜在化石。