rill stage

例句：

1. 1. The rill stage is a crucial period for the growth of aquatic plants.
   小溪阶段是水生植物生长的关键时期。
2. 2. During the rill stage, the plant's roots penetrate the soil and begin to absorb nutrients.
   在小溪阶段，植物的根穿透土壤并开始吸收养分。
3. 3. The rill stage is also important for the survival of fish and other aquatic animals.
   小溪阶段对于鱼类和其他水生动物的生存也至关重要。