pretensioned prestressed concrete girder

例句：

1. 1.The beam is pretensioned to withstand the weight of the roof.
   这个梁是预张的，以承受屋顶的重量。
2. 2. The concrete girder is pretensioned to resist the load during construction.
   混凝土梁是预张的，以抵抗施工期间的负载。
3. 3.The pretensioned girder is used in bridges to improve their strength and durability.
   预张的梁用于桥梁中，以提高其强度和耐久性。