residual clay

例句：

1. 1. The soil in the garden is rich in nutrients, making it ideal for growing vegetables.
   花园里的土壤富含养分，非常适合种植蔬菜。
2. 2. The construction crew used residual clay to reinforce the foundation of the building.
   建筑工人使用残余粘土加固了建筑物的基础。
3. 3. The study found that residual clay could be a significant source of pollution in rivers and lakes.
   研究发现，残余粘土可能是河流和湖泊污染的一个主要来源。