growth of the radicle downward into the soil

例句：

1. 1.The radicle of the plant is visible through the soil.
   植物的根可以通过土壤看到。
2. 2. The growth of the radicle downward into the soil is crucial for the plant's survival.
   根向下生长到土壤中对植物的生存至关重要。
3. 3.The roots of the tree are deep in the earth, providing it with support.
   树的根深深地扎在土里，为它提供支撑。