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Millionsofaircrafttakeoffaroundtheworldeveryyear.Theski...
問題詳情:Millionsofaircrafttakeoffaroundtheworldeveryyear.Theskiestheyflyinseemlimitless-milesofemptyspace.But,withthenumberofflightsincreasingeachyear,thisemptinessnolongerexists.Researchersintheworld...