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哈哈。Understand the benefits of using proxies to implement a single-column patternThe process of taking the teacher's qualification certificate is as follows:Pacific Battlefield: 1.38 million Japanese troops, 120,000 US troops and 30,000 British troops died, with a death ratio of about 9.2: 1Use reasonable data sampling: It is necessary to ensure that a small number of entities (including IP or users) cannot account for most of the model training data. In particular, care should be taken not to pay too much attention to false positives and false negatives reported by users. This may be achieved by limiting the number of examples that each user can contribute or using attenuation weights based on the number of reported examples.绷脸道：你不是才吃的元宵和馄饨？小葱也觉得这个借口不大好，但话已经出口，收不回来了，耍赖道：那碗小的很，元宵在我煮馄饨的时候就消化光了。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.