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世界是一本書，不旅行的人只讀了一頁。

數學中最重要的是理解概念，而不僅僅是記憶公式。

"The use of traveling is to regulate imagination by reality, and instead of thinking how things may be, to see them as they are."

There are tracts in my life that are bare and silent. They are the open spaces where my busy days had their light and air.

我們都帶著某種與生俱來的罪惡感出生。