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
- water environment regulation
- water erosion
- water erosion in China
- water erosion prediction model
- water escape structure
- water eutrophication
- water eutrophication monitoring
- water extractor
- waterfall
- waterfall cave
- waterfall field
- Waterfall landscape
- waterfall landscape
- waterfall model
- waterfall spectrum
- water features lighting in landscape architechture
- water fee management
- water-fertilizer coupling effectsof crop
- water filament
- water filling test of hydro-generator unit
- water filling type
- water film scrubber
- water fire-extinguishing system
- water-flooded layer logging evaluation
- waterflood-induced fracture