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The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used.
书籍是我们能送给孩子的最珍贵的礼物。
The essence of mathematics lies in its freedom.
I'm not going to apologize for being who I am.
粮仓充实,民众就能知道礼节;衣食充足,民众就能知道耻辱。