【英语翻译P19Itseemstousthattheearthstandsquitestill.Butitisreallymovingallthetime.Itturnsaroundamake-believelinethroughitscenter.Wecallthismake-believelinetheearth'saxis.Thetwoendsoftheearth'saxisarecalledi】

　　英语翻译

　　P19

　　Itseemstousthattheearthstandsquitestill.Butitisreallymovingallthetime.Itturnsaroundamake-believelinethroughitscenter.Wecallthismake-believelinetheearth'saxis.Thetwoendsoftheearth'saxisarecalleditspoles.Itmakestheearthtwenty-fourhourstravelarounditsaxisonce.

　　Welookatthesunandsayit"rises"andtravelsacrossthesky,butthesundoesn'treallydoso.Itistheturningoftheearthwhichmakesusfeelasifthesunweremovingacrossthesky.Wecan'tseethattheearthismovingbecauseeverythingelseontheearthisturningwithus.Astheearthturnsaroundeverytwenty-fourhours,firstonehalffacesthesunandthentheotherhalf.Whenourhalfoftheearthisfacingthesun,wesayitisday.Whenourhalfisawayfromthesun,wesayitisnight.Itistheturningoftheearththattellsuswhentogotobedandwhentogetup.

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