root clay

例句：

1. 1. The soil is rich in organic matter, making it ideal for planting vegetables.
   土壤富含有机物，非常适合种植蔬菜。
2. 2.The farmer used a mix of root clay and sand to improve the drainage of his fields.
   农民使用根黏土和沙的混合物来改善他的田地的排水。
3. 3. The engineer analyzed the chemical composition of the root clay to determine its suitability for use in construction.
   工程师分析了根黏土的化学成分，以确定其是否适合用于建筑。