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In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:This trip to the countryside gave me a deeper understanding of the basic situation in our country's countryside. We all went to places with high incidence of cancer, and personality is Shexian, the place with the highest adjusted mortality rate in the country. After investigation, the local environmental pollution is relatively serious. Although there are "Top Ten Well-off Villages" and more factories have brought economic benefits, they have also brought great pollution to the local environment. In the past, farmers had to drink polluted water. At the moment, deep wells have been drilled to drink clean and sanitary water. However, many factors in various fields still cause the high incidence of cardiovascular diseases and cancer in the area. Some families have seen the phenomenon of "poverty due to illness and returning to poverty due to illness". The implementation of the national new rural cooperative medical system has effectively relieved the economic pressure of patients' families. To a certain extent, it has curbed the phenomenon of returning to poverty due to illness and causing poverty due to illness, promoted the development of rural health services, promoted the change of farmers' concept of seeking medical treatment, and also enhanced the image of the Party and the government for private affairs. However, many farmers still do not know enough about this policy.安桐数次想要带兵突围，均告失败。奇妙命运的齿轮现在开始转动。I don't care whether you are Baidu's written examination or Ali's or Tencent's pen examination questions. My side is collectively referred to as the WrittenTest. Then your company has different pen examination questions, which will be implemented by subclasses. No matter how the parent class method is implemented, I don't care what the pen examination questions are. The code changes to the following:The picture shows Mr. Sun taking a photo with the captain.看见他们来，紫茄忙招手道：小葱姐姐，蝉儿姐姐，淼淼师姐，快来瞧。