logical model的用法和樣例：
例句
- The logical model for a relational database normalizes the entities and relationships into tables with foreign key constraints.
關係型資料庫的邏輯模型進一步規範化這些實體和關係，並形成帶有主外鍵約束的表。 - How are general representational constructs used to encapsulate information about the elements defined in the logical model?
大會代表是如何構建用於封裝信息內容界定的邏輯模型？
