soil animal

例句：

1. 1. Soil animals play a crucial role in maintaining the balance of the ecosystem.
   土壤动物在维持生态系统平衡中起着至关重要的作用。
2. 2. The soil animal population has been declining due to over-use of pesticides.
   由于过度使用农药，土壤动物的数量正在下降。
3. 3.Researchers have discovered that certain soil animals can be used as indicators for environmental health.
   研究人员已经发现某些土壤动物可以作为环境健康的指标。