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數學教會我們邏輯思考并系統地處理問題。

不要看時鐘，做它該做的事。繼續前進。

一滴墨水，可以喚起千百萬人的思想。

For me they normally happen, these career crises, often, actually, on a Sunday evening, just as the sun is starting to set, and the gap between my hopes for myself and the reality of my life starts to diverge so painfully that I normally end up weeping into a pillow.