菜单管理器可包含菜单项、其它菜单管理器(用于子菜单)和分隔符。
A menu manager can contain items, other menu managers (for submenus), and separators.
我已经提到，我们将把在桌面的底部区域作为一个导航栏。现在，我们需要添加导航菜单项和一些分隔符。
I already mentioned that we would use the bottom area of the desk as a navigation bar. Now we need to add the navigation items and some separators.
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