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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.张良仍是欠身恭送，恢复了他往日谦谦君子的做派。At this time, many people think that gender affects the classification ability of babies, but Professors Heron and Slaughter do not think so. They think that the difference in classification ability of babies of different genders is not due to gender, but due to the different knowledge and experience they have acquired. For example, the fact that male babies can classify cars may be that they pay more attention to the color and wheel movement of toy cars and pay less attention to the information of dolls.唐紫尘有些惜才，便传授王超一招国术里真正的招式。《设得兰谜案》第四季已获得预定，依旧由Douglas Henshall主演，预计于2018年播出。第四季由David Kane担任主要编剧，将会延续第三季的模式，用六集篇幅讲述一个完整的案件。