soil mantle

例句：

1. 1. The soil mantle is essential for the growth of plants and animals.
   土壤覆盖层对于植物和动物的生长至关重要。
2. 2.The soil mantle is responsible for retaining water and nutrients in the soil.
   土壤覆盖层负责在土壤中保留水分和养分。
3. 3.The soil mantle helps to prevent erosion and maintain soil quality.
   土壤覆盖层有助于防止侵蚀并保持土壤质量。