知识贝壳
知识贝壳
所属栏目：建筑施工英语
TheearliestbridgeswereprobablylogsthrownacrossstreamsorthestoneslabclapperbridgessuchasthosestillsurvivinginDevon,England.Anothertypeofwatercrossingwasprovidedbybridgesformedbyboatsfixedtogether.TheGreekhistorianHerodotus(485—425BC)providedtheearliestdocu ......（本文共 5980 字 ） [阅读本文] >>