您也可以通过工具栏或菜单访问delete操作，该操作能够删除以所选择的节点为根节点的子树。
The delete action is also accessible via the toolbar or the menu and has the effect of deleting the subtree rooted at the selected node.
pulldom构建在minidom之上，但是可以有选择地构建子树。
Pulldom is built on top of minidom, but can selectively build subtrees.
对依然无法完成的分析，选择若干最宽子树强制匹配输出。
To which is still unable to complete the parsing, chooses certain widest subtrees compulsion matched and then outputs.
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