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The oldest, shortest words—'yes' and 'no'—are those which require the most thought.
最古老、最简短的词语——'是'和'否'——是需要最多思考的。
世界上充满了自童年以来从未以开放的心态迎接开放门道的人。
Mathematics is not a spectator sport; you have to play to understand.