This property defines how many back arrow special label characters (<-) are added to the menu item in the MNS file for the menu.
该属性定义了在菜单文件MNS中的菜单项中需要添加的返回箭头(<-)的数量。
That's why we don't have an arrow here, because we could go back, this way too.
这就是为什么我们这里没有用箭头的原因,因为我们可以过渡回去,像这样。
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