树干的

例句：

1. 1. The tree has a strong trunk and branches spread out.
   这棵树有强壮的树干和分叉的树枝。
2. 2. The old tree had a thick trunk that was difficult to climb.
   那棵老树有一个厚厚的树干，很难爬。
3. 3. The tree's trunk is covered in moss and vines.
   这棵树的树干上覆盖着苔藓和藤蔓。