compacted sub-soil base

例句：

1. 1. The construction crew used a compactor to prepare the site for the new building.
   施工队使用一台压路机为新建筑准备场地。
2. 2.The engineer recommended that the foundation be made of compacted sub-soil to ensure stability.
   工程师建议地基由压实的下层土壤制成，以确保稳定性。
3. 3. The project manager was concerned about the potential for water infiltration into the compacted sub-soil base.
   项目经理担心水分可能会渗入压实的下层土壤基础。