常見例句The roof of the gymnasium looks like a soaring eagle. Its main structure is a triangular steelframe. 體育館的屋頂看上去象一只展翅的雄鷹。它的主體結(jié)構(gòu)是一個(gè)三角形的鋼屋架。Unbraced steelframe 無支撐鋼框架 返回 steelframe