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He has not learned the first lesson of life who does not every day surmount a fear.
学习的每一个方面或智能的任何其他特征都可以原则上被精确描述,以至于可以制造一台机器来模拟它。
The biggest risk is not taking any risk. In a world that is changing quickly, the only strategy that is guaranteed to fail is not taking risks.