concrete cover

例句：

1. 1.The concrete cover was designed to protect the structure from damage.
   混凝土覆盖层设计用来保护结构免受损害。
2. 2.The engineers were working on a project that required a concrete cover for the foundation.
   工程师们正在一个项目中工作，该项目要求对地基进行混凝土覆盖。
3. 3.The construction crew used a special concrete mix to create a durable concrete cover for the building.
   建筑施工队使用了一种特殊的混凝土混合物来为建筑物创建耐用的混凝土覆盖层。