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The combination mode is also called part-to-whole mode. The combination mode combines objects into a tree structure, which is used to represent the relationship between the whole and the part. The combination mode enables clients to treat individual objects and combined objects equally. For example, in. NET, simple controls such as WinForm controls, TextBox and Label inherit from the Control class, while composite controls such as GroupBox also inherit from the Control class. The specific structure diagram of the combination mode is shown below.3. The supervision of students is relatively weak and the sense of learning scenes is low.Application Scenario 2: Virtual Agent is to create expensive objects as needed. It is used to store real objects that take a long time to instantiate. For example, for large HTML Web pages, picture frames replace real pictures through virtual agents.因为，他们发现敌人都往东面追去了。说着两人又挥舞着刀剑砍杀到了一起，狠辣凌厉的招式已经不是先前那般小打小闹了。仇弟成功盗取胶卷，却也招来敌人的疯狂报复。郭天明被绑架，组织查出胶卷拍摄的是日本细菌实验的数据，日方却以郭天明作为交换胶卷的筹码。面对两难境地，仇弟勇闯虎穴，给敌人沉重打击。