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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:Good or bad temper childish要不是玉米是个小孩子，还只当是跟着她爹在茶馆听书呢。All MDT members are equal to each other and are good at accepting different valuable opinions.戴拉因为一场事故失去了父母。且遭到了法庭不公的审判，生活因此发生巨变。只能和姐姐二人搬去奶奶家生活。戴拉开始努力学习中文。因此结识了出身富贵却同样憎恨不平等的阿卡，并渐渐爱上了她。/doh (loud noise)