TheearliestbridgeswereprobablylogsthrownacrossstreamsorthestoneslabclapperbridgessuchasthosestillsurvivinginDevon,England.Anothertypeofwatercrossingwasprovidedbybridgesformedbyboatsfixedtogether.TheGreekhistorianHerodotus(485—425BC)providedtheearliestdocu (共 5980 字) [閱讀本文] >>