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A mathematician is a device for turning coffee into theorems.
The most important things in life often cannot be expressed in words.
To understand recursion, one must first understand recursion.
我生来就是为了赢,但为了赢我必须愿意输。
科学家研究自然并非因为它有用;他研究它是因为他从中获得乐趣,而他从中获得乐趣是因为它是美丽的。