trunk bulkhead

例句：

1. 1. The tree's trunk is covered in bark.
   这棵树的树干上长满了树皮。
2. 2. The trunk of the tree was damaged by a storm.
   这棵树的主干因暴风雨而受损。
3. 3. The trunk of the tree is about 40 feet tall.
   这棵树的主干大约高40英尺。