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2. The policy pattern provides an open-closed principle, making the code easier to understand and expand.3) The migration between different hardware platforms is extremely painful and incompatible.曾被陷害抄袭并遭遇众叛亲离后被强行送出国的服装设计师苏北，在时隔七年以后以金牌模特经纪人的身份华丽归国。For example, the company's year-end bonus is assessed according to the employee's salary and performance. For those with performance A, the year-end bonus is 4 times the salary, for those with performance B, the year-end bonus is 3 times the salary, and for those with performance C, the year-end bonus is 2 times the salary. Now we use the general coding method to write the code as follows:她想起了菜花，你一个人在外。　　很多年前，银河系另一端的两颗行星被黑洞所吞噬，两个尚在襁褓中的外星孩子乘坐飞行器来到地球。拥有超能力的他们在截然不同的环境中长大，也造就了各自不同的性格和人生走向。长大后，仪表堂堂、正气凌然的成为了保卫城市和平的城市超人（布莱德·彼特 Brad Pitt 配音），而相貌猥琐、蓝皮大头的则化身破坏人民安康的大坏蛋麦克迈（威尔·法瑞尔 Will Ferrell 配音）。他们终日争斗，战争不断。城市超人博物馆开幕当天，麦克迈成功越狱，并劫持了美丽的女主播罗珊（蒂娜·费 Tina Fey 配音）。在天文台的终极决战中，麦克迈成功击败多年的老对手，完全统治了这座城市。Having said so much, summarize the application scenarios of the three adapter modes: