sand filling

例句：

1. 1. The engineer used sand filling to reinforce the foundation.
   工程师使用沙填来加固地基。
2. 2.The sand filling was carefully packed to ensure stability.
   沙填被仔细地填充以确保稳定性。
3. 3. The construction crew was working on a project that involved sand filling.
   施工队正在一个项目中进行沙填工作。