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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:蔗糖女王第二季现已开播，英语中字。 第二季即将如期而至的登陆,一个全新的生活让主角开始适应,不管他是否愿意,都必须承载这些,也许这不是年轻人该有的生活,但祖上的事业也不是说放弃就能放弃的.@www.vv4.ccKnowingIn fact, the scene we described above is not perfect, Because the target address of the message accessed by the client may not be the local machine, but other servers. When the kernel of the local machine supports IP_FORWARD, we can forward the message to other servers. Therefore, at this time, we will mention other "levels" in iptables, that is, other "chains". They are "before routing", "forwarding" and "after routing". Their English names are照片秦旷用力闭了下眼睛，又努力睁开，问道：香儿妹妹不睡？林聪听了生气地想：睡不睡关你屁事？忽然觉得托他照顾香儿不是个好主意。Title Category: