saddle backed girder

例句：

1. 1. The bridge is designed with a saddle-backed girder to providestability.
   这座桥设计有鞍背式桁架，以提供稳定性。
2. 2. The construction ofthe bridge involved the use of saddle-backed girders for its mainbeams.
   建造这座桥时，使用了鞍背式桁架作为主梁。
3. 3. Theengineer carefully analyzed the design of the saddle-backed girder to ensureits strength and durability.
   工程师仔细分析了鞍背式桁架的设计，以确保其强度和耐用性。