packed layer

例句：

1. 1.The engineer carefully packed the soil around the tree to prevent it from being damaged during construction.
   工程师小心翼翼地将土壤围在树周围，以防施工过程中损坏树木。
2. 2. During the rainy season, the ground is packed with water and becomes very soft.
   雨季时，地面被水填满，变得非常柔软。
3. 3. The construction crew used a special material to pack the soil, ensuring that the foundation was stable.
   施工队使用了一种特殊材料来填充土壤，确保地基稳固。