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- 问题详情：Inthemiddleofwinter,whensnowisfallinginmanypartsoftheUnitedStates,scientistshavesoundedawarningtopeoplewhoplantospendmanyhoursinthesunthissummer.Thewarning:Thesun’ssummertimeraysaremoredangerousthanoncethought.Ateamofscientistsfrom80nationsr...
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