- 问题详情:About500yearsago,theSpanishexplorerChristopherColumbusprovedtheEarthwasround.NowAmericanauthorThomasFriedmantellsustheEarthisflatinhisbestseller:TheWorldIsFlat:ABriefHistoryoftheTwenty-FirstCentury.Ifheisnotjoking,thenwhyistheworldflat?Friedm...
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