土壤中的微生物对植物生长至关重要。

___Micro-organisms in the soil are essential for plant growth.

这些微小的微生物帮助分解落叶，使土壤更肥沃。

These tiny ___micro-organisms help break down fallen leaves, making the soil more fertile.

这些微生物被用于污水处理厂分解有机废物。

These ___micro-organisms are used in sewage plants to break down organic waste.