stratified foundation

例句：

1. 1. The soilis stratified with layers of different minerals.
   土壤分层，含有不同矿物质的不同层次。
2. 2. The city's infrastructure is stratified, with different levels of services for different populations.
   城市的基础设施分层，为不同人群提供不同级别的服务。
3. 3.The data is stratified by region, providing insights into regional differences in economic growth.
   数据按地区分层，提供了关于区域经济增长差异的见解。