给菜单管理器添加操作。

You add actions to menu managers.

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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.

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一旦创建了菜单管理器，就可以用菜单栏、上下文菜单(也就是弹出菜单)或工具栏下拉菜单表示它。

Once you have created a menu manager, it can be represented by either a bar menu, a context menu (in other words, a pop-up menu), or a toolbar drop-down menu.

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