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URL：https://www.thoughtco.com/thmb/O6A-87jhWz-oNDFcdTxX5Sn--AI=/768x0/filters:no_upscale():max_bytes(150000):strip_icc()/KarlMarx1880HultonGetty-56a042b55f9b58eba4af92c5.jpg 掲載元：https://www.greelane.com/ja/科学技術数学/社会科学/sociology-of-knowledge-3026294/
