理学 数据库系统设计 释 semantic data model 语义数据模型 一种基于高层语义的数据库描述和结构形式，是具有较强的语义功能的模型。
数据库 数据库应用开发 释文 semantic data model 语义数据模型
- foam metal for sound absorption
- foam method
- foam physics
- foam printing
- foam rubber
- foam sizing
- foam spray system
- foam stabilizer
- foam-water deluge system
- foam-water dry pipe system
- foam-water preaction system
- foam-water sprinkle system
- foam-water wet pipe system
- foamy urine
- focal
- focal adhesion
- focal area
- focal axis
- focal chord
- focal circle
- focal conic
- focal conic defect
- focal conic texture
- focal cubic
- focal curve