Lisp语言被设计成可扩展的，很容易为其添加新功能。
The Lisp language is designed to be extensible, and it is easy to add new features to it.
I’ve found time can heal most anything.
The only way to get through life is to laugh your way through it. You either have to laugh or cry. I prefer to laugh. Crying gives me a headache.
The real difficulty lies not in devising new ideas, but in escaping from the old ones.