prestressed medium

例句：

1. 1.The prestressed concrete beam is themain load-bearing member in thebridge.
   预应力混凝土梁是桥梁的主要承重构件。
2. 2. The prestressed concrete beam isused to support the weight of the bridge.
   预应力混凝土梁用于支撑桥梁的重量。
3. 3. Theprestressed concrete beam is a crucialcomponent of the bridge's structure.
   预应力混凝土梁是桥梁结构的关键组成部分。