n.底土，心土
v.翻起…的底土

The subsoil is composed primarily of clay and gravel.
地下土层主要由粘土和碎石构成。
Agricultural experts recommend deep plowing to loosen the hard-packed subsoil.
农业专家建议深耕以疏松坚实的下层土壤。
The construction project encountered unexpected difficulties due to a layer of solid rock beneath the subsoil.
建筑项目由于地下土层下方存在一层坚硬的岩石而遇到了未预料到的困难。
The subsoil's high water table makes it unsuitable for building a basement.
下层土壤的高地下水位使其不适合建造地下室。
The farmer added organic matter to improve the fertility of the subsoil.
这位农民添加有机物质来提高下层土壤的肥力。
In this region, the subsoil is often rich in mineral resources.
在这个地区，地下土层常常富含矿产资源。
Before planting trees, they dug deep pits to expose the subsoil for better root development.
种植树木之前，他们挖了深坑以暴露下层土壤，以便于根系更好地发育。
The analysis of the subsoil revealed the presence of heavy metals, which could pose a risk to groundwater quality.
对地下土层的分析显示含有重金属，这可能对地下水质造成风险。
The archaeologists found ancient artifacts buried several feet below the subsoil.
考古学家在地下几英尺深处的下层土壤中发现了古代文物。
Due to the subsoil's composition, engineers chose a pile foundation for the new bridge construction.
由于地下土层的结构，工程师们为新建桥梁选择了桩基础。