Individual attachment — the DimeAttachment class can be created based on the attachment type and a stream, which represents the attachment content.
个别附件——依照附件类型和流创建dimeattachment类,它表示附件的内容。
Rather than create subclasses for all the combinations of possible roles, a class is created for each individual role.
它不是为所有的可能角色组合创建子类,而是为每个单独的角色创建一个类。
Unlike instance variables, class variables are associated with all objects of a particular class and not with individual objects.
与实例变量不同的是,类变量与该类所有的对象关联在一起而非某个特定的对象。
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