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允許進入的刺激并不是通過簡單的一對一開關與輸出反應相連的。

Flow is being completely involved in an activity for its own sake. The ego falls away. Time flies. Every action, movement, and thought follows inevitably from the previous one, like playing jazz. Your whole being is involved, and you're using your skills to the utmost.

解釋：沒有不犯錯誤的完人，只要能及時改正自己的錯誤，就是最好的了。

品德的高低決定著人生的高度。

多項式時間歸約的概念對于理解NP完全問題的結構至關重要。