cement iron

例句：

1. 1.The construction site was covered with a layer of cement.
   施工现场覆盖着一层水泥。
2. 2.The engineer used cement to reinforce the foundation.
   工程师使用水泥加固地基。
3. 3. Cement is essential for building structures.
   水泥对于建筑结构至关重要。