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Mediator pattern defines a mediation object to encapsulate the interaction between a series of objects. Intermediaries do not need to explicitly refer to each other between objects, thus reducing coupling and independently changing their interaction behavior. The specific structure diagram is as follows:The outer surface is plated with copper, and the raw material of the core wire is mainly iron, which is usually used for residual wire and cheap network jumper wire. The transmission interval is very close, which is attributed to the worst of the network cables of the above four raw materials. The best method of detection is to test it with a magnet, which can usually be identified by a magnetic screwdriver.Let's take the figure as an example to see which tables all the rules on the prerouting "chain" exist in.[Cross-border E-commerce Self-built Station] Sales in the e-commerce market in the United States continue to rise. According to Statistics, the annual online sales in the United States will exceed 735 billion US dollars by 2023. This is very exciting news.After reading a book "Deliberate Practice" today, I suddenly thought of a text "Oil Seller" that I learned at first.越王当真是不简单啊，云青山第二次有了这样的想法。