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如果你只经历过美好的事情,你就不可能勇敢。
"I’m not perfect. I make mistakes like everyone else."
The only constant is change, continuing change, inevitable change, that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be.
To do mathematics is to engage in a dialogue with the universe, seeking answers to questions we may not even know how to ask yet.