短语词组短语mansard flat roof 复折式平板屋顶mansard d roof 折线形屋顶mansard truss roof 折线形屋顶mansard roof truss 折线形桁架mansard roof construction 折线形屋顶结构mansard roof with slanted struts 有斜撑的折线形屋顶 返回 mansard roof