This is a user-defined value that is used to represent the menu item.
这是一个用户自定义的值，用这个值来表示这个菜单项。
Item types are defined and modified in the order in which they appear.
按项类型的出现顺序定义和修改项类型。
When a property, item definition, or item is defined, its value is evaluated.
定义了属性、项定义或项后，将会计算其值。
Item definitions are defined and modified in the order in which they appear.
按项定义的出现顺序定义和修改项定义。
Item definitions are defined and modified in the order in which they appear.
按项定义的出现顺序定义和修改项定义。
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