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In essence, classification is to find the common points and differences of things in our thoughts. It is the basic method and ability for us to know and understand the world. On the basis of classification, it is possible to judge and reason, and to form concepts and make decisions. Classification requires comprehensive demonstration activities such as association, analogy, reasoning and extension, and is the basic cell of thinking.肌肤似雪，这话一样有些淡淡的绯红。所以这份功劳无论如何也不能落入李左车之手。Mediator pattern defines a mediation object to encapsulate the interaction between a series of objects. Intermediaries do not need to explicitly refer to each other between objects, thus reducing coupling and independently changing their interaction behavior. The specific structure diagram is as follows:********下章晚八点。The attacker forges the source ip address of the syn as the ip address of the target, and the server response is sent directly to the targetFar East Battlefield: 100,000 Japanese Dead, 10,000 Soviet Dead, 10: 1 Death Ratio on Both Sides