Can record the clients' book borrowing and returning information, the important node can remind the clients to avoid the late fees led by forgetfulness, to speed up the circulation of books.
记录用户书籍借还的相关信息，重要节点提醒用户，避免遗忘导致滞纳金的产生，加快书籍流通性。
Can record the clients' book borrowing and returning information, the important node can remind the clients to avoid the late fees led by forgetfulness, to speed up the circulation of books.
记录用户书籍借还的相关信息，重要节点提醒用户，避免遗忘导致滞纳金的产生，加快书籍流通性。
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