For a root object, the root type.
对于根对象，显示根类型。
The object used for the root object isn't very scalable.
用于根对象的对象不是非常可伸缩。
At the heart of a Ranvier application is a create_application function that defines a root object.
Ranvier应用程序的核心是create_application函数，它定义一个root对象。
Gets the expression representing the root object in the object graph.
获取表示对象图中的根对象的表达式。
If the object is present and the expression matches, the root object will be returned.
如果该对象存在并且与该表达式匹配，则将返回根对象。
This object contains the root object of the graph and the expression that represents it.
该对象包含关系图的根对象和表示它的表达式。
Set root object for scene hierarchy. Root object coordinate system becomes scene global coordinate system.
为阶层式场景设置根对象，根对象的坐标系会成为场景全局坐标系。
Set root object for scene hierarchy. Root object coordinate system becomes scene global coordinate system.
为阶层式场景设置根对象，根对象的坐标系会成为场景全局坐标系。
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