规则同样会检查对象层级结构中上层对象的熟悉，检查顶级对象与父类的连锁关系。

The algorithms also check properties of objects that are higher in the object hierarchy, checking up the chain of parents to the top object.

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父工作可以是最上层工作，也可以是其他工作的子系。

The parent task may be a top-level task or it also may be the child of another task.

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取得指定物件的直接上层父物件。

Gets the immediate parent object of a given object.

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