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到了小屋门口，黎水先闪身进屋。板栗还在书房看书，张槐吩咐他立即去叫郑氏过来。　　在首领叶飞的领导下，众人在交易地点上为夺取两张有关军火资料的电脑磁碟展开生死战。过程中，叶飞与一神秘女子方盈大打出手，一段扑逆迷离的感情在不自觉间发生。叶飞虽然最后能夺取其中一张磁碟，可是却招来其上司杀子之祸，同时自己亦被陷害而踏上逃亡之路，幸得方盈相助才能脱离困境。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:路桥川（武雨泽 饰）、钟白（徐晓璐 饰）和任逸帆（于翔 饰）是高中时代的好友，彼此之间感情十分要好，三人共同考入了同一所大学，展开了属于他们的多姿多彩的大学生活。在学校里，钟白和路桥川结识了海洋（庞瀚辰 饰）、十三（应岱臻 饰）、一心（桑砚 饰）等好友，与此同时，钟白从高中一直延续到现在的对于路桥川的暗恋亦愈演愈烈。Application Scenario of Decorator Mode: