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。
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。
The various controls are grouped in several parallel panes, one level deep. But this idiom is often abused.
不同控件组成多个平行窗格，只有一个层次深度，但是这种习惯用法经常被滥用。
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