A data base / data communication ( DB / DC ) system capable of managing complex data bases and networks. It is a proprietary IBM software product, and uses the hierarchical data model in data base management.是什么意思_A data base / data communication ( DB / DC ) system capable of managing complex data bases and networks. It is a proprietary IBM software product, and uses the hierarchical data model in data base management.在线翻译_英语_读音_用法_例句