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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?Network Address TranslateSo far, a simple file upload program has been written. Of course, this is still a counterexample. The disadvantage here is the same as the first code in the light example. The program is full of if and else conditional branches. The state and behavior are coupled in a huge method. It is difficult to modify and extend this state machine. This problem is exacerbated by the complexity of the links between file states但眼前的戚继光，现在管的正是浙江都司的兵器事宜，天赐良机，不可错失。Game Production: 4A Games吕馨连忙翻开书页。