mature soil

例句：

1. 1. The farmer carefully nurtured his mature soil to produce high-quality crops.
   这位农民小心翼翼地照料他的成熟土壤，以生产高质量的作物。
2. 2. The city's growth is heavily dependent on the quality of its mature soil.
   城市的发展和质量在很大程度上依赖于其成熟土壤的质量。
3. 3. The research team studied the effects of different types of mature soil on plant growth.
   研究团队研究了不同类型成熟土壤对植物生长的影响。