除了父，没有人知道子；除了子和子所愿意指示的，没有人知道父。
No one knows the Son except the Father, and no one knows the Father except the Son and those to whom the Son chooses to reveal him.
每个部件(除了顶层部件外，比如主窗口)必须是某个确切父部件的子部件。
Each widget (except for top-level ones, such as MainWindow) must be the child of exactly one parent.
它清除了之前所创建的所有动态元素、基于新的数据模型创建了新的动态元素并将它们添加到预定义的父元素中。
It clears all dynamic elements created previously, creates new dynamic elements based on the new data model, and adds them to the predefined parent.
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