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ThomasAlvaEdisonwasawardedmorepatents(专利)oninventions...
问题详情: ThomasAlvaEdisonwasawardedmorepatents(专利)oninventionsthananotherAmerican.Whenhediedin1931,Americanswonderedhowtheycouldbestshowtheirrespectforhim.Onesuggestionwasthatthenationobserveamin...