selfhardening sand

例句：

1. 1. The construction crewused selfhardening sand to build thefoundation of the new building.
   建筑工人使用自硬化砂来建造新大楼的基础。
2. 2.The engineer found that the selfhardeningsand was not suitable for use in thisparticular project.
   工程师发现这种自硬化砂不适合用于这个项目。
3. 3. The builders used selfhardening sand to create a smooth surfacefor the floor.
   建筑师们使用自硬化砂来为地板创造一个光滑的表面。