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
- Belorussians
- Belousov-Zhabotinski reaction
- Belousov-Zhabotinski reaction, BZ reaction
- Beloved
- Belovezhskaia-Pushcha Agreement
- below cloud scavenging
- below-cloud scavenging
- below-cloud scavenging of gases
- belowground biomass
- belt
- belt channel
- Belt Collins
- belt continuously variable transmission
- belt conveyor
- belt conveyor driving device chamber
- belt desmosome
- belt drive
- belt dryer
- belt hook
- belting
- belt-nodal theory
- Belt of Orion
- belt of totality
- belt pinch
- belt press filter