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Extracting and summarizing their common aspects, essential attributes and relationships from specific things, and discarding individual, non-essential aspects, attributes and relationships, this process of thinking is called abstraction. Abstraction means different meanings in different fields. The word "abstract" is Latin, which is the original meaning of exclusion and extraction. In natural language, many people refer to things that cannot be directly grasped by people's senses, that is, what is commonly called "invisible, intangible," is called "abstract"; others use "abstract" as isolation. , one-sided, synonymous with poor and empty thought content. These are the extensions and escaping of "abstract".