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张家三个表姐弟，张嘉超、姜萌萌、张兆阳都在海外留学。张嘉超因为母亲大腿骨折，不得不回国照看；姜萌萌学成回国；张兆阳由于被学校开除早已偷偷潜回国内。原本打算当富太太的姜萌萌遭遇未婚夫临阵逃跑；拿着国外假文凭的张兆阳整日游手好闲；曾经强奸张嘉超的于海飞，竟然成了姜萌萌的新男朋友。张嘉超先后经历了父亲亡故、噩梦重温，终于战胜自我，接受了真爱，并决定留在国内，投身到祖国的科学事业之中；姜萌萌在失业中找到了自我价值，成长为独立女性；张兆阳也决定脚踏实地工作。苞谷道：先要学。　　讲生意-一时间，相关言论越发多了。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.D