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我不知道。有时候当我感觉快哭出来的时候,往往会演变成一种几乎想笑的冲动。那一定是我当时的真实感受,因为我笑了,几乎咯咯咯地笑了。
I don't run out of material. I run out of time.
The power of mathematics is in its abstraction, allowing us to see patterns and connections that are not immediately obvious.