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The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows:　　私立樱才学园，原本是传统的女子高中，但因少子化问题影响，不得不改制为男女合校。作为改制后第一年入学的28名男性新生之一的津田隆利，偶然之下被拉入了学校的学生会。在外人看来，学生会是美女如云的天堂，但是津田身边的三位学生会女干部性格都非常独特，津田开始了他每天学生会的吐槽生活。警官杰克·霍伊特被晋升到了洛杉矶警察局的毒品缉查部，经验丰富的黑人警官阿洛佐·哈里斯负责教杰克一些基本的规条和知识。阿洛佐在那些混乱的街区颇有威望，他仿佛天生具备某种奇特的侦查能力能够迅速找寻到罪案的蛛丝马迹，被同伴们称为“魔幻之眼”。这种神秘的“第六感”使他成为洛城最出色的警官之一。　　通过小姨淑美，玝爷认识了具有维新思想的文海澄，推荐给光绪，深为赏识并委以重任。在淑美的捉弄下，玝爷竟闹出了与朱帘秀“私奔未遂”的闹剧。碍于面子，玝爷只身到通州，却掉入了世铎设下的陷阱中，被诬成劫镖之人，拉赴刑场问斩 ………"About 70% of cancer patients were scared to death by themselves. Professor He believes that at least 30-40% of patients die of psychological factors." "Among tumor patients, 66% suffer from depression, 10% suffer from psychiatric weakness and 8% suffer from obsessive-compulsive disorder, which indicates that at least 84% of tumor patients suffer from psychological problems of varying degrees." In the past, the opinion and propaganda that one would not have a few months to live with cancer created cancer terror and was not conducive to treatment. Many deaths of cancer patients are related to this kind of publicity. At present, some doctors use the media to create the terror of certain diseases in the name of promoting medical knowledge in order to promote business. For example, cervical inflammation can lead to cervical cancer and should go to his hospital for gynecological examination and treatment. Inflammation will produce canceration. Where there is no inflammation, canceration will also occur. Therefore, canceration is not inevitable for the development of inflammation. Writing such an article is uneasy and kind, without scientific basis, which makes women with cervicitis nervous.故事以于凡（周润发）及江浩文（梁朝伟）两个生活不同环境的人物，带出现实社会的一个小片段。于凡从事电影替身及特技人，浩文则是一间顾问公司的小职员，两人的遇上，极不咬弦而成为难兄难弟。于凡极爱同居的女友杜旖玲，但旖玲不喜欢他这种无规律的工作，两人终于分手。而浩文因在公司内不得志，愤而辞职，后更与于凡同住。于凡与浩文无意中被牵涉入一宗毒品案中，但两人毫不知情，更被黑帮用荷兰杀手宋波（任达华）追杀。另一方面，浩文加入社区中心当社工，因工作关系，浩文结识了康嘉欣（陈秀珠），两人展开一段恋情。而杀手宋波一方面对嘉欣展开追求，一方面又要杀害于凡与浩文，故事发展曲折，出人意表。