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Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.Bridging mode aims to decouple abstraction and implementation so that the two can change independently. That is to say, the bridging mode further abstracts the implementation details of the original base class into an implemented structure, and then transforms the original base class into an abstract hierarchical structure, thus realizing independent changes of the system in multiple dimensions. The structure diagram of the bridging mode is shown below.Forty-sixth fire technical service institutions in violation of these Provisions, one of the following circumstances, shall be ordered to make corrections, fined 20 thousand yuan to 30 thousand yuan:沈悯芮立刻扶住了翘儿：你别慌，千万别慌。在上海一条不起眼的小弄堂里，有一家只在深夜营业的小餐馆，老板是一位50岁左右的大叔，他会为每一个到访的食客做一份只属于他（她）的食物，一碗饭一个故事，一碟菜一段人生，暖心抚慰都市夜归人。Lifetime预订Global的六集安乐死题材的剧集《死亡医生玛丽第一季》，Caroline Dhavernas担任主演。本剧由Tara Armstrong创作并参与联合制作，讲述了白天担任急诊室医生的单身母亲Mary Harris（Dhavernas 饰），在晚上她兼职成为地下“死亡天使”，帮助重病症末期的病人依照他们的意愿结束他们的生命。长久以来Mary已经能够做到兼职时不被人发现，但是死亡太多，生意越来越红火，他她的双面生活也越来越复杂艰辛。当她的世界开始公诸于世时，她意识到如果她还想干这份工作，就要背水一战。Jay Ryan、 Richard Short、Lyriq Bent、Greg Bryk和Charlotte Sullivan也将参演。