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The Validator class, here as the Context, is responsible for receiving the user's request and delegating it to the strategys object. In the above code, we first create a Validator object, and then add some validation rules to the Validator object through the validator.add method. The validator.add method receives 3 parameters, as follows:Basically, the interpreter pattern is used to make various interpreters, such as interpreters for regular expressions, etc.20,000 Yuan Guo Yujie, Editor of Liu Ziheng's "Imperfect Victims: Recent Situation of Wushan Child Brides and Sisters"10,000 Yuan Zhao Xiaojuan Zhang Junli Life and Death Beinmei Editor Xu Yue他们家人说是在三年前买的。The rules for PREROUTING can exist in: raw table, mangle table, nat table.The so-called logical triangle is the product of concretizing the pyramid structure. The bottom of the length of the triangle represents the comprehensiveness of the factual basis, and the height represents the strength of the Sowhat (or Why) connection. In other words, the key is to use enough and balanced fact mats to construct the logic that tightly connects Sowhat and Why.