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In the realm of mathematics, every problem is an opportunity to discover something new and profound.
The dead are always looking down on us, they say. But we don't look back.
别难过……世界上有许多人还不知道他们到底是谁或什么。
我们必须愿意失败,愿意犯错,愿意带着学到的教训重新开始。
The best way to predict the future is to create it.