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更让人心动的应该是相里氏本身，他们掌握了墨家机关术。尹旭忍不住有些兴奋，很是开怀。真正的商贩不是卖商品，而是卖品性。有人卖自己的知识，有人卖自己的劳动，有人卖商品。从这个意义上来讲，无论卖什么，谁不都是商贩？那么，成功的商贩和失败的商贩之间有什么不同之处？The research on classification ability is more in kindergartens and more in primary schools. Research by cognitive psychologists has found that children under 0-1 years old basically have no classification ability, and they mainly rely on individual perception. The classification ability of children aged 1-3 has begun to sprout, but the concept of "category" has not yet formed. The classification of children aged 3-5 is basically still based on external perceptible dimensions such as shape and color. For example, children in small classes in kindergartens are asked to classify red plastic balls, red apples and bananas. They will divide the balls and apples together, either according to the shape (circle) or according to the color (red), but they will not put apple kernel bananas together according to the function (edible). What if you add another celery?完全是为了将徐家拖下水。无论如何，机不可失。Author: Mutual Gold and Investment