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Criteria for physical examination and accreditation of flight students enrolled in civil aviationAfter completing the practical activities, everyone gathered together for lunch, exchanged what they had gained from the practical activities, and talked about what they thought were the shortcomings of the practical activities. We all talked freely about our own experiences. After returning to school, we took a group photo again in front of the public health building. Although we were already very tired, everyone had a confident and satisfied smile on his face.经好友刘明浩介绍，杨瑞参加了京师体校跆拳道训练班，他在那里认识了干杂工的安心。安心清纯的外貌，忧郁的眼神、迷一样的身世深深吸引了杨瑞。随着他们交往的增多，杨瑞渐渐知道了安心坎坷复杂的经历……This fully shows that the classification ability is closely related to the existing knowledge.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?林聪也好奇起来，问道：令尊居然能有如此襟怀？真奇人也。Next, we are going to implement the Validator class, which is used here as Context and is responsible for receiving the user's request and delegating it to the strategy object, as follows: