With ActiveRecord, you can also nest the: include option, but only one level deep.
通过ActiveRecord，还可以嵌套：include选项，但嵌套深度只有一级。
But, our experience shows that nesting the two languages more than one level deep is usually not needed to express the desired query logic.
但是，我们的经验显示，表达所需的查询逻辑通常并不需要两种语言的嵌套层次超过一层。
The hierarchy of menus has been flattened down until it is only one level deep .
这里菜单只有一级，层次关系扁平化了。
Exposes methods and properties on user interface (UI) elements that are part of a structure more than one level deep, such as a list box or a list item.
公开用户界面(UI)元素的一些方法和属性，这些元素是具有多级深度的某个结构(例如列表框或列表项)的一部分。
Exposes methods and properties on user interface (UI) elements that are part of a structure more than one level deep, such as a list box or a list item.
公开用户界面(UI)元素的一些方法和属性，这些元素是具有多级深度的某个结构(例如列表框或列表项)的一部分。
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