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The world is very complicated, full of phenomena, facts and various viewpoints (insights, lies and deception). We need to extract the consistency behind them in order to quickly understand and understand the world. This consistency is the dimension in the classification. The classification of the three worlds is just to find a classification method for countries that we have not used before. The traditional classification of countries is based on geographical location (five continents), population (large and small countries) and development stage, while the three worlds are classified according to their relationship.小媳妇也偷瞟了夫君一眼，抿嘴笑道：怎么都俊。MDT team members should respect and trust each other.Combined with all the above descriptions, we can summarize the process of data packets passing through the firewall as follows:What are the Sichuan stars?