ready-mixed concrete

例句：

1. 1.The construction crew was busy mixing and pouring ready-mixed concrete.
   施工队忙于混合和浇筑预制混凝土。
2. 2. The engineers were reviewing the design of the new building's foundation, which included ready-mixed concrete.
   工程师们正在审查新建筑地基的设计，其中包括预制混凝土。
3. 3. The contractor had to ensure that the ready-mixed concrete was delivered on time for the project.
   承包商必须确保预制混凝土按时交付，以便项目顺利进行。