常见例句The roof of the gymnasium looks like a soaring eagle. Its main structure is a triangular steelframe. 躰育館的屋頂看上去象一衹展翅的雄鷹。它的主躰結搆是一個三角形的鋼屋架。Unbraced steelframe 無支撐鋼框架 返回 steelframe