precast concrete cover

例句：

1. 1. The construction crew used precast concreteto build the foundation of the new building.
   施工队使用预制混凝土建造了新建筑的基础。
2. 2. The precast concrete cover is designedto protect the structure from external forces.
   预制混凝土覆盖层设计用来保护结构免受外部力量的影响。
3. 3. The precast concrete cover wasinstalled over the old asphalt surfaceto prevent it from deteriorating.
   预制混凝土覆盖层被安装在上面旧的沥青表面上，以防止其退化。