树桩

例句：

1. 1. The old tree hada large root that was difficult to remove.
   这棵老树有一个很大的根，很难移除。
2. 2. The roots of the tree wereexposed after the storm.
   暴风雨过后，树的根部暴露了出来。
3. 3. The tree'sroot system is essential for its survival.
   树的根系对于它的生存至关重要。