This paper gives the methods of combining databases and discusses some corresponding problems such as geometry transformation of inputing datar into database, inlay of databases and connection of edges in HG-db3 system.是什么意思_This paper gives the methods of combining databases and discusses some corresponding problems such as geometry transformation of inputing datar into database, inlay of databases and connection of edges in HG-db3 system.在线翻译_英语_读音_用法_例句