理学 系统模型 释 metamodel 元模型 定义概念并提供用于创建构建模型的构建元素（语言和过程）对一种描述性模型的简化或者近似的另一种描述性模型。 理学 元模型体系结构 释 meta model 元模型 元模型体系结构中的一个层次。
软件工程 释文 meta model 元模型
- urban resilience for disaster
- urban revitalization
- Urban Riots
- urban road
- urban road capacity
- urban road detection
- urban road form
- urban road grade
- urban road intersections
- urban road network
- urban road network planning
- urban road system
- urban road system planning
- urban road traffic control
- urban road traffic indication
- urban road traffic landscape
- urban road traffic light environment
- urban road traffic lighting
- urban road traffic sign
- urban road traffic surveillance system
- urban road tunnel
- urban-rural coordination
- urban-rural development
- urban-rural development transformation
- urban-rural differences