短語詞組短語roof -truss structure 屋架結搆型式roof truss -arched structure 桁架拱結搆knee -brace roof truss 隅撐屋架line -bent roof truss 折線形屋架cable -like roof truss 索式鋼屋架arch -shaped roof truss 拱形屋架saw -tooth roof truss 鋸齒形屋架quadrangular -pyramid roof truss 四角錐屋架 返回 roof truss