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我不是悲观主义者,我是一个受过悲观主义训练的乐观主义者。
The difference between the impossible and the possible lies in a person’s determination.
数学家的工作大多是孤独的追求,但它建立在许多其他人的工作之上。
The idea of America is so important to me. It's about freedom, democracy, and the ability to create your own destiny.