impervious stratum

例句：

1. 1.The soil is made up of layers of different impervious strata.
   土壤由不同不可渗透层组成。
2. 2.The scientist found a new way to extract oil from the impervious stratum.
   科学家发现了一种新的方法，可以从不可渗透层提取石油。
3. 3. The engineer designed a machine that could drill through the impervious stratum.
   工程师设计了一台机器，可以穿透不可渗透层。