问长城多长用英语怎么说

TheGreatWallisaseriesofstoneandearthenfortificationsinChina,builtfromthe5thcenturyBCtothe16thcenturyAD.ThelengthoftheGreatWallvariesaccordingtodifferentsources,butitisgenerallybelievedtobearound21,196km(13,171miles).InEnglish,youcansay\"TheGreatWall\'slengthisapproximately21,196kilometers(13,171miles)\"orsimply\"TheGreatWallis21,196kilometers(13,171miles)long.\"