TheLeaningTowerofPisawasnotleaningwhenitwasbuiltin1173a...
问题详情：TheLeaningTowerofPisawasnotleaningwhenitwasbuiltin1173anditwasstraightlikeapole.Itstartedtoshiftdirectionsoonafterconstructionbecauseofpoorfoundationinadditiontothelooselayerofsubsoil(底土).At...