prestressing force

例句：

1. 1.The steel beam is prestressed to resist the weight of the building.
   这个钢梁被预应力以承受建筑物的重量。
2. 2. The concrete beam is prestressed to increase its strength.
   混凝土梁被预应力以提高其强度。
3. 3. The prestressing force is applied to the beam before it is loaded.
   在加载之前，将预应力力施加到梁上。