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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.谁都羡慕的生活，富裕的恋人。没有什么不满。Elf=ELF ('001')Country Name Death and Injury Total Death and InjuryTibet Autonomous Region你……你……你还惦记她。快活林是江湖上一个神秘的杀手组织，它的主人高老大是一个水性杨花而又贪得无厌的女人，孟星魂和叶翔从小受高老大抚养，长大后都被训练成数一数二的剑客，叶翔在一次执行任务时失败，从此就酗酒成性，被高老大唾弃。孟星魂受命去刺杀人称老伯的江湖盟主孙玉伯。在刺杀前，偶遇孙玉伯的女儿小蝶，二人一见倾心。