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Play is the language of childhood, and books should speak that language too.

Money is not the key to happiness, but it helps.

擺脫誘惑的唯一方法就是屈服于它。

The essence of science is to ask the right questions.

自由市場是經濟繁榮的關鍵。

幸福就是能夠不帶恐懼地認識自己。