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 diversion
- water diversion for noshing sand
- water diversion from Wenshui River to Grand Canal
- water diversion project
- Water Diversion Project at Upper Reaches of Huangpu River
- water diversion project from the Yellow River to the canal in ancient China
- Water Diversion Project from Yellow He to Shanxi Province
- water diversion structure of hydropower station
- water-diverting agent
- waterdivide
- water door
- water drainage measures for mine
- water drainage of concentrators
- Water Drainage Standard for Mariculture
- water draught gauge
- water-drawing permit
- water-drawing permit system
- water-drawing right
- water drive
- Water-driven Astronomical Clock Tower
- water-driven blower
- water-dropper
- water dropwort
- water ecological civilized city
- water ecological culture