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I think of a hero as someone who understands the degree of responsibility that comes with his freedom.

Nothing is funnier than unhappiness.

I don’t focus on the past, I focus on the present.

數學是理性的音樂。

煤炭行業要堅定不移地走安全高效、清潔低碳的發展道路。

Don't worry about what anybody else is going to do. The best way to predict the future is to invent it.