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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:徐风被放在床上的一瞬间，还是觉得不死心，又摸了一把却依旧是老样子。叶子豪和妻子上官倩经营实体玉石生意，家境也算富裕一族，可叶子豪喜欢冒险，总觉得平淡的生活中缺少了什么。这天，叶子豪在街上认识了林浩，两人意气相投，很快聊的火热。说起玉石，林浩更是口若悬河的如数家珍。叶子豪对林浩很是佩服，经过进一步了解，叶子豪聘请林浩帮助自己打理生意，林浩感恩叶子豪对自己的赏识，遂一口答应，两人日后还结为了兄弟。那么西楚国的铁骑冲阵将会更为容易，付出的代价更少，还能够事半功倍。