trunk prefix

例句：

1. 1. The tree's trunk is thick and sturdy.
   这棵树的树干又厚又结实。
2. 2. The trunk of the tree was badly damaged in the storm.
   这棵树的树干在暴风雨中严重受损。
3. 3. The trunk of the tree is where the roots grow.
   这棵树的主干是根生长的地方。