If a deep clone is not returned, the run-time behavior is undefined.

如果未返回深层克隆，则运行时行为将不可确定。

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This method returns a copy that is a deep clone of your binding context.

此方法返回作为绑定上下文的深层克隆的副本。

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This creates a complete copy of the current binding element object tree, also called a deep clone.

这将创建当前绑定元素对象树的完整副本，也称为深层克隆。

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