logical model的用法和样例：
例句
- The logical model for a relational database normalizes the entities and relationships into tables with foreign key constraints.
关系型数据库的逻辑模型进一步规范化这些实体和关系，并形成带有主外键约束的表。 - How are general representational constructs used to encapsulate information about the elements defined in the logical model?
大会代表是如何构建用于封装信息内容界定的逻辑模型？
