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As it will be in the future, it was at the birth of Man--- There are only four things certain since Social Progress began: That the Dog returns to his Vomit and the Sow returns to her Mire, And the burnt Fool’s bandaged finger goes wabbling back to the Fire.

就像将来会发生的一样，这是在人类诞生的时候——自从社会进步开始以来，只有四件事是肯定的:狗回到它呕吐的地方，母猪回到它的泥潭里，被烧伤的傻瓜包扎着的手指摇摇晃晃地回到火里去。

— Rudyard Kipling 鲁迪亚德·吉卜林