precast concrete

例句：

1. 1. The construction site was covered with a layer of precast concrete.
   施工现场被一层预制混凝土覆盖。
2. 2. Precast concrete is often used in bridges and buildings for its durability and strength.
   预制混凝土常用于桥梁和建筑物，因其耐用性和强度而受到青睐。
3. 3. The engineer designed the precast concrete structure to meet specific load requirements.
   工程师设计了预制混凝土结构以满足特定的负载要求。