短语词组短语steel for bridge 桥梁用钢steel temporary bridge 钢便桥Upper Steel Arch Bridge 上钢拱桥continuous steel truss bridge 连续钢桁粱桥steel hanging bridge 钢吊桥steel beam bridge 钢梁桥steel access bridge 钢引桥steel pipe bridge 钢管桥 返回 steel bridge