The data we store in each menu item object is an array containing only one element: the name of the category.
我们储存在每个菜单项对象中的数据是一个仅包含一个元素的数组：类别名。
The one line of code in the class body of Order defines its relationship to the Item object.
在Order类体中有一行代码定义了它与Item对象的关系。
The one line of code in the class body of Order defines its relationship to the Item object.
在Order类体中有一行代码定义了它与Item对象的关系。
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