That represents a plus sign button of a tree view node.
它表示树视图节点的加号按钮。
The Dynamic View node shows object members but does not allow editing the values of the members.
动态视图节点显示对象成员，但不允许编辑成员的值。
To delete the views from the Server Explorer tree, right-click on the appropriate view node in the tree, and select the delete option.
要从Server explorer树中删除视图，右键单击树中相应的视图节点，然后选择Delete选项。
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