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The study of black holes has revolutionized our understanding of space and time.

The farmer is the only man in our economy who has to buy everything at retail, sell everything at wholesale, and pay the freight both ways.

最大的財(cái)富是知足常樂。

【釋義】：當(dāng)面贊譽(yù)他人的人往往不夠忠誠，只注重外表修飾的人往往缺乏真情實(shí)意。