Courage is not the absence of fear, but rather the judgment that something else is more important than fear.

函数的概念在数学中是基础的，而λ演算提供了一种形式化这一概念的方法。

I'm not afraid to speak my mind and stand up for what I believe in.

我们必须挑战现状，并不断寻求更好的做事方式。