单词	extract coal
释义	extract coal 采煤
随便看	entity-relationship databases entity relationship data model entity-relationship desige entity-relationship design Entityrelationship diagram entity relationship diagram entity-relationship diagram entity relationship diagrams entity-relationship diagrams entity-relationship-entity entity relationshiper entity relationshipER entity relationship mode entity relationship model entity-relationship model entity-relationship modeling entity-relationship models entity-relationship modesl entity-relationship reeognition entity relationship relation entity-relationships entity relation template entity reserve entity resolution entity reverse