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Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.3. Each receiver knows only one other object, that is, its successor in the chain.在收集定义过程中，他们发现了一个叫W.C.迈纳（西恩·潘饰演）的医生独自贡献了一万多条引语，这是一个专业语言学者都很难完成的工作量。当编委会决定向他致敬时，一个惊人的事实曝光了：原来迈纳医生，是美国内战时期部队的一个军医，因为患有精神分裂症而犯杀人罪，被禁闭在精神病院，是一个被认为是疯子的人。Http://baike.baidu.com/view/1306799.htm2. In the two-person and five-person team formation mode, players can choose to match with strangers to form a team to become a team, or they can open a black match with friends,2. Ling Yunyue (E) kicks the target (the first paragraph can be put before QC starts, then the second paragraph)