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Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:Against DiludaCBS正式续订剧集《犯罪现场调查：网络》。The construction of intelligent factories cannot be separated from the wide application of industrial software. Industrial software includes basic and application software, of which systems, middleware and embedded belong to the scope of basic technologies and are not closely related to specific industrial management processes and technological processes. The following industrial software mainly refers to application software, including operation management, production management and research and development design software.弟兄们陪我一起杀。银行职员田中胆小懦弱没自信，常常受到同事和上司的白眼和训斥，有一天，他竟然收到了一把枪，这把枪给了田中心理上的支持，从此他就能挺直身板做人啦。（草なぎ剛、小日向文世饰）岳灵珊最大的错误就是，她根本不了解林平之。