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朗费罗幽默的秘密源泉并不是欢乐而是悲伤。天堂里没有幽默。
Every mathematical theorem is a story, a narrative that unfolds through logic and reason, leading to a deeper understanding of the world.
The more you know about yourself, the more patience you have for what you see in others.
Sometimes the best ideas come from the most unexpected places.