在这方面经常犯的一个错误是在Exception或者Error下复制了一棵应用程序对象树。
One of the mistakes often made in this regard is to replicate under Exception or Error a tree of application objects.
为了把信息传递给应用程序，DOM创建和XML文件元素树完全相同的对象树，每个XML元素都用树中的一个节点表示。
To pass on information to the application, DOM creates a tree of objects that duplicates exactly the tree of elements from the XML file, with every XML element being a node in the tree.
从树视图中显示的可用对象中，选择要从数据库引入到应用程序中的对象。
From the available objects displayed in the tree view, select objects from the database to bring into the application.
由应用程序的根对象开始遍历对象树，而不是强迫每个对象保持一个对它的引用的轨迹（像COM中一样），来判定一个对象是否可达。
The GC determines whether an object is reachable by walking the object tree from the application's root object instead of forcing each object to keep track of references to it, as in COM.
由应用程序的根对象开始遍历对象树，而不是强迫每个对象保持一个对它的引用的轨迹（像COM中一样），来判定一个对象是否可达。
The GC determines whether an object is reachable by walking the object tree from the application's root object instead of forcing each object to keep track of references to it, as in COM.
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