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田地里高低不平，跑得趔趔趄趄。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:However, online organizations are also facing many challenges at this stage.宁王气势更加高昂，似乎随时都会发飙。"Let's tell the story of three little pigs building a house tonight!"国家大事还会站出来一个黄光升拼一拼，扶乩误国这类事，忠臣恨，奸臣也恨，唯有比奸臣还要奸的徐阶不恨，这正是他除掉严嵩的手段。FIBA has a 40-minute match and a 10-minute halftime break. NBA game lasts 48 minutes and halftime lasts 15 minutes.