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Spaceisdangerousplace,notonlybecauseofmeteors(流星)butals...
问题详情:Spaceisdangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofraysfromthesunandotherstars.Theatmosphereagainactsasourprotectiveblanketonearth.Lightgetsthrough,andthisisessentialforplantst...