tight sand

例句：

1. 1. The beach was covered in a thick layer of loose sand.
   沙滩上覆盖着一层松散的沙子。
2. 2. The construction crew had to work with the tight sand and rocks.
   建筑工人不得不与紧实的沙子和岩石一起工作。
3. 3. The engineer carefully packed the tight sand to ensure stability.
   工程师小心翼翼地将紧实的沙子压实，以确保稳定性。