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• Ifyouwatchtheskyforaboutanhourafterthesungoesdown,youma...

• 问题详情：Ifyouwatchtheskyforaboutanhourafterthesungoesdown,youmayseesome“movingstars”.Butthey’renotrealstars.They’reman-madesatellites(人造卫星).AndthebiggestofallistheInternationalSpaceStation(ISS).FromMaytoJulyisthebestseasontowatchtheISSflyingo...
• 2019-05-0415725