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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:Loughing fields and the muddy waters, then mixed with water to create a dye solution, and eventually take back to where it came from, all in the frame environment responsible cycle.上世纪20年代旧上海，俨然一个冒险家的乐园。成千上万的人蜂拥至此，只为实现那“一朝富贵，平步青云”的美梦。当然，正引起巨大的诱惑性，各色人等纷繁踏至，鱼龙混杂，好一个混乱喧闹所在。孝明年间，山河动荡，武林黑暗。隐姓埋名的侯府公子左卿辞，以江湖游医身份，在两月之期内，寻找一卷遗失的山河图，由此结识了易容盗贼飞寇儿。飞寇儿背景神秘，为给师父苏璇盗药不慎曝光身份，竟是正阳孽徒——苏云落。　　说不出话的老人惊诧继而怨恨的目光一直到咽气都停留在伊川夏身上，成了伊川夏的夜夜梦魇。她希望年良修能来上海和自己在一起，开始是希望，后来希望多了就成了年良修的压力，年良修感觉到威胁。该剧本大纲以抗战时期晋察冀边区成长壮大为背景，讴歌了以阜平人耿三七为代表的冀中儿女、八路军指战员在国难当头之际，奋起打击侵略者的革命精神，生动再现了晋察冀边区波澜壮阔、可歌可泣的抗战画卷。