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First, unify the interfaces:Definition:格雷西的母亲是一名出色的联邦特工，在一次任务中不幸殉职。格雷西（桑德拉•布洛克 Sandra Bullock 饰）长大后继承了母亲的事业，也成为了一名联邦特工。格雷西从小就脾气刚烈、不修边幅，作为“假小子”的她并不受欢迎，只有她的拍档兼好友艾瑞克（本杰明•布拉特 Benjamin Bratt 饰）理解她。Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From Encyclopedia珍姐呢個大劇，暫名《跨世代》，愛將歐陽震華同田蕊妮一定係鐵膽啦。仲有陳豪、邵美琪、蕭正楠同張繼聰， 至於力捧嘅麥明詩，角色亦有大發揮。 珍姐出盡人情牌，搵陳慧珊返無綫，又搵埋姐級中嘅姐級趙雅芝返嚟客串，總之卡士有咁大搞咁大。兩個台慶劇，真係打崩頭。