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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:回想起来，因为最肤浅的理由而成为警察的川合麻依非常后悔。　　莉莎被人反锁在屋中。她大呼救命，可惜小洁怎么弄都没有把门弄开。那条毒蛇渐渐接近了莉莎。她很害怕，朋达赶到救了她。艾夫人责怪朋达不该那么关心莉莎，但朋达说应该照顾好她。小洁劝莉莎冷静一点，让她不要意气用事On the whole, the product is still very good, whether it is road running or cross-country, it is fully competent.郡守只有治理地方的行政权，至于驻军那自然要掌握在自己心腹之后，军队才是最大的威慑。When making decisions, one should not immediately think about what activities or plans to do to detonate. These are only means of execution and are the final result of the decision-making process.关键时刻，缠流子意外得到父亲制作的黑色神衣，由此战斗力大增。连番激烈的战斗在本能字学园展开……