短语词组短语arch -rib tied bridge 拱肋系杆拱桥special -shaped spatial combination arch-rib 异形空间组合拱肋braced -rib arch 桁助拱non -uniform arch rib 变截面肋steel -pipe arch rib 钢管拱肋slab -rib arch bridge 板肋拱桥dumbbell -shaped arch rib 哑铃形拱肋 返回 arch rib