WhenEdisoninventedthelightbulb,hetriedover2000experimen...
問題詳情：WhenEdisoninventedthelightbulb,hetriedover2000experiments__36 hegotittowork.Ayoungreporteraskedhimhowitfeltto 37 somanytimes.Hesaid,"Ineverfailedonce.Iinventedthelightbulb.Itjust 38...