In many situations, a reference to the current node (.) is the right approach.
在很多情况下，引用当前的节点(.)。
First, it allows you to store a reference to your application object on a Node.
首先，它让您可以将对应用程序的引用储存在一个Node上。
Click OK when prompted to create a reference on the source node.
当系统提示在源节点上创建引用时，请单击ok。
Naturally I keep only the reference to the root node of such three.
自然我只能把这三根节点参考。
Naturally I keep only the reference to the root node of such three.
自然我只能把这三根节点参考。
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