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饭卡、洗澡卡、借书卡……大家在学校里天天拿着卡生活和学习,它们到底有什么原理,藏着什么秘密?解剖饭卡
Meal card, shower card, borrowing a book card ... Everyone in the school holding card life and learning every day, what principles do they have, hidden what secret?