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The trolley school bag is a kind of schoolbag that has emerged in recent years. It refers to a schoolbag that is more portable and suitable for children in shape like a trolley suitcase. Different from the schoolbags that children usually use, the trolley schoolbags are equipped with trolleys and small wheels, so that children do not have to frown when facing too many books. They only need to drag them away. And now many trolley schoolbags are designed to be detachable. When there are not many books, the child can remove the trolley and just carry the ordinary schoolbag directly on the body.