prestressed heat-insulation string

例句：

1. 1. The beamis prestressed to resist bending under load.
   这个梁是预应力的，以抵抗负载下的弯曲。
2. 2.The concrete slab is prestressed to improve its strength and durability.
   混凝土板是预应力的，以增强其强度和耐久性。
3. 3. The reinforced concrete beam is prestressed to withstand the weight of the building.
   加固混凝土梁是预应力的，以承受建筑物的重量。