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Using monomer mode can make the code organization more consistent and make the code easy to read and maintain.再者，进入咸阳城后，立即进入秦国皇宫，难免户让人有所误会。For easier management, We can also create custom chains in a table, Place the rules set for an application in this custom chain, But custom links cannot be used directly, It can only work if it is called as an action by a default chain. We can imagine that, Custom chain is a relatively "short" chain. The rules on this "short" chain are all formulated for an application program. However, this short chain cannot be directly used, but needs to be "welded" on the default definition chain of IPTables before it can be used by IPTables. This is why the default definition "chain" needs to refer to "custom chain" as "action". This is a later remark. We will talk about it later. We can understand it more clearly in actual use.大哥现在是越来越谨慎。张良之所以建议刘邦进军胡陵也是出自这样的考虑，一方面可有扩展自己的根据地，另一方面扩大自身实力和影响力，说白了都是在捞取政治资本。State mode and policy mode are like twins. They both encapsulate a series of algorithms or behaviors. Their class diagrams look almost identical, but their intentions are very different, so they are two very different modes. The policy pattern and the state pattern have in common that they both have a context, policies or state classes to which the context delegates the request to execute