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Factory method: Create a single object, which is used in Abstract Factory.Exit flight simulator functionAccording to a survey conducted by the Mental Health Research Group of the Chinese Academy of Sciences, children of all ages in China have different degrees of dysfunction and development imbalance in reading comprehension, concentration, thinking, oral expression and other abilities, and the number is increasing year by year. It can be seen from this that whether it is due to the requirements of the school or the needs of the children themselves, the parents' needs for the cultivation of their children's thinking ability and the needs for the bridging learning between young and young are objective and increasing.Outstanding figures in all fields rely on a lot of practice//022　　…抗战结束，中共派人到东北创办航校组建空军。戴笠知悉情况后，派出特工“13号”，实施“死鹰”行动，企图剿杀中共空军雏鹰。一场国共间惊心动魄的明争暗斗拉开帷幕。