branch knot

例句：

1. 1. The tree hasa branch knot at the top of itstrunk.
   这棵树的树干顶部有一个分枝结。
2. 2. The scientist found a branch knoton the fossilized tree.
   科学家在化石树中发现了一个分枝结。
3. 3. The branchknot is where the tree branches out.
   分枝结是树分叉的地方。