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数学不是关于数字、方程、计算或算法的:它是关于理解的。
Children have real understanding only of that which they invent themselves, and each time that we try to teach them something too quickly, we keep them from reinventing it themselves.
在一个乐队里的想法是成为帮派的一部分。
天子认为对的未必对,天子认为错的未必错