好的系统不能具有较弱的命令语言。

"The challenge of quantum mechanics is not in its complexity, but in its simplicity—it forces us to rethink our most basic assumptions about the universe."

The present is always an unstable place, the past is where we think we know where we are.

《诗经》上说“必须选择所使用的染料，必须谨慎地来浸染”，就是这个意思。