TheLeaningTowerofPisawasnotleaningwhenitwasbuiltin1173a...
問題詳情：TheLeaningTowerofPisawasnotleaningwhenitwasbuiltin1173anditwasstraightlikeapole.Itstartedtoshiftdirectionsoonafterconstructionbecauseofpoorfoundationinadditiontothelooselayerofsubsoil(底土).At...