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Three, two, a little fairyFour: Understanding the Agency ModelIn real life, Li Lei faced such a choice. In 2012, my father was diagnosed with advanced cancer. Until the last day of his father's life, Li Lei chose "active treatment".The length of the socks reached the ankle and I felt very low, but now I like socks that exceed the ankle.I read some strategies and said that it is OK to kill the first five firearms division in a fixed sequence, but to be on the safe side, please use the bridge as the dividing line and kill the first seven in the sequence indicated on my map! ! !郑氏则汗颜：当娘的还不如闺女。We can understand that the responsibility chain mode is a chain composed of processing requests. Requests are passed between these objects in turn until we encounter an object that can process it. We call these objects nodes in the chain. For example, object a sends a request to object b. If object b does not process, it will give the request to c. If object c does not process, it will give the request to d, and so on, until one object can process the request. Of course, if no object processes the request, then the request will leave the chain.