root top of onion

例句：

1. 1. Theroots of the tree are visible in thesoil.
   树的根部在土壤中可见。
2. 2.The root system is essential for the plantto survive.
   根系对于植物的生存至关重要。
3. 3. Theroots of the tree are visible in thesoil.
   树的根部在土壤中可见。