root of herbaceous peony with bark

例句：

1. 1. The tree's root system extends deep into the soil.
   这棵树的根系深入土壤。
2. 2. The roots of the plant help it to grow and survive in its environment.
   植物的根系帮助它生长并在其环境中生存。
3. 3.The roots of the tree are visible through the soil.
   树根通过土壤可见。