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德國傑出的自然學家亞歷山大．洪堡德在喀山拜訪俄國非歐幾何學的創建者羅巴切夫斯基時，他問數學家：「為什麼您只研究數學呢？據說您對礦物學的造詣也很深，對植物學也很精通。」「是的，我很喜歡植物學，」羅巴切夫斯基回答說：「將來等我結了婚，我一定建一個溫室……」「那您就趕快結婚吧。」「可是恰恰與願望相反，植物學和礦物學的業餘愛好，使我終生只能是單身漢了。」
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