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In the first four cases, the current activity lifecycle is:Typical plot: Because I have no money, I spend every day in the bathhouse with rice and live on kelp soup and eggs. Will sing and wriggle along the street at night and fart loudly. 　Focus and devotion are critical//189她急忙从袖子里扯出手帕子，仔细地帮小娃儿擦泪，一边想着如何答。……有板栗的儿子张念祖，李敬文的儿子山子，葫芦的娇女儿雪莲、儿子雪峰，黄瓜的儿子雪晖。Uncle has gone to do his own thing, and Meng forced him to continue to consume your time....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: