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Ifyouwatchtheskyforaboutanhourafterthesungoesdown,youma...
问题详情:Ifyouwatchtheskyforaboutanhourafterthesungoesdown,youmayseesome“movingstars”.Butthey’renotrealstars.They’reman-madesatellites(人造卫星).AndthebiggestofallistheInternationalSpaceStation(ISS...