The concept of legal validity is crucial for understanding the nature of law.

发现的兴奋永远不会消退。

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。

The world is indeed full of peril, and in it there are many dark places; but still there is much that is fair, and though in all lands love is now mingled with grief, it grows perhaps the greater.

"The inner spaces that a good story lets us enter are the old apartments of religion."