Spaceisdangerousplace,notonlybecauseofmeteors(流星)butals...
問題詳情:Spaceisdangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofraysfromthesunandotherstars.Theatmosphereagainactsasourprotectiveblanketonearth.Lightgetsthrough,andthisisessentialforplantst...