prestressing

例句：

1. 1. The beam was prestressedto support the weight of the roof.
   梁被预应力以支撑屋顶的重量。
2. 2. The concretebeam is prestressed to resist theload during construction.
   混凝土梁被预应力以抵抗施工期间的负载。
3. 3. The steel cables are prestressed to ensure thestability of the bridge.
   钢缆被预应力以确保桥梁的稳定性。