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In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:TCP State Depletion Attack　　其余演员包括Sophie Rundle﹑Derek Riddell﹑Veronica Clifford﹑Sylvia Syms﹑Brendan Patricks﹑Caspar Phillipson﹑Polly Maberly﹑Lucy Black﹑Stephanie Hyam﹑Dino Fetscher﹑Rupert Vansittart﹑Michael Xavier﹑Gemma Whelan﹑Timothy West﹑Gemma Jones﹑Stephanie Cole﹑Peter Davison﹑Amelia Bullmore﹑Vincent Franklin﹑Shaun Dooley﹑Joe Armstrong及Rosie Cavaliero。"Web Security" CSRF Attack and Defense, the First Defense Line for Web SecurityI won't repeat much about the profound and pure theoretical explanation here. After all, the written explanation is too lenient. I'm going to say something simple and visible here. Let's start now.两丫头都笑起来，于是黄芽接过斗笠，将一把暗红油纸伞递给他。