NHEDB is an extensible DBMS based on the relational DBMS(NHDB).The data model of the system is an extended relational model which supports ADT and NF2.是什么意思_NHEDB is an extensible DBMS based on the relational DBMS(NHDB).The data model of the system is an extended relational model which supports ADT and NF2.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句