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Bad as our urban conditions often are, there is not a slum in the country which has a third of the infantile death-rate of the royal family in the middle ages.

尽管我们的城市环境常常很糟糕，但该国没有一个贫民窟的婴儿死亡率达到中世纪王室婴儿死亡率的三分之一。

— J. B. S. Haldane 约翰·伯顿·桑德森·霍尔丹