secondary loess

例句：

1. 1. The region is famous for its secondary loess, which has been used as a building material for centuries.
   该地区以其次生黄土而闻名，这种土壤被用作建筑材料几个世纪了。
2. 2.The secondary loess in the area is rich in minerals and nutrients, making it an ideal location for agriculture.
   该地区的次生黄土富含矿物质和养分，是农业的理想地点。
3. 3. Due to heavy traffic on the roads, the secondary loess layer is compacted and difficult to dig.
   由于道路重压，次生黄土层被压实，难以挖掘。