删除符号 meaning in English

delete mark
delete symbol

After you rename or delete a symbol in your code , it might continue to appear as an error node within a class view folder
在代码中重命名或删除符号后，该符号可能仍然以一个错误节点的形式出现在“类视图”文件夹内。
However , a couple of additional steps are required as you can ' t simply remove the symlink and create a new file with the same name
为什么不能简单地删除符号连接，文中所给的方法和删除符号连接有什么区别？看不出来。