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However, in the actual use process, Rules are often defined through "tables" as operators. The reason why iptables are introduced according to the above process is that it is easier to understand them from the perspective of "checkpoints" and from the perspective of entry. However, in order to understand them more smoothly in actual use, we also list the relationship between each "table" and "chain" here.郑老太太笑道：这想法是好。Proxy is an object, which can be used to control access to ontology objects. It implements the same interface as ontology objects. Proxy objects will pass all calling methods to ontology objects. The most basic form of the proxy mode is to control access, while the ontology object is responsible for executing the function or class of the assigned object. Simply speaking, the local object focuses on executing the code on the page, while the proxy controls when the local object is instantiated and used. We have used some proxy patterns in the above monomer patterns, that is, using proxy patterns to instantiate the monomer patterns, and leaving other things to ontology objects.其实无形之中也是为鲁元的安全加上了一点砝码，当真是一石数鸟。After graduating from college, I have been very interested in using mathematical methods to write programs to solve problems. At the same time, I also keep reading all kinds of books and papers on computer science, and I am lucky to catch up with the upsurge of machine learning and in-depth learning that has arisen in the past ten years.