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故事主要描述家人之间的纽带，从一个戏剧性的节点开始：在一对老夫妇结婚5 0周年前，丈夫问妻子想要什么生日礼物，得到的答案却是“离婚书”。普通的一家人就这样遭遇到一场危机，所有成员都以此为契机抒发了自己内心的不满。Policy Analysis白川的行为是杀人还是过失致死连日被议论中，已经被议论的安乐死法案的成立带有现实意义。在那个背后策划日本的医疗改革的团体，更加使用反对派的医生和宣传媒体安排安乐死法案的阻止的康代。白川不久就被急流吞没了。迷失在黑暗，哪怕只有一点星光，也能唤起希望。 　　无论从商从政，还是读书做研究，都比练国术，更实在，更有前途。In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.II. Application Value of BIM Technology in Construction