The logical model of the database is simply a representation of all the data requirements of the user, put into a normalized form.
数据库的逻辑模型仅仅是对用户的所有数据需求的一种表示，它将这些需求变成一种范式。
If the form of representation is the logical form, then the picture is called a logical picture.
如果这种表现形式是逻辑的形式，那么图像也可以称为一幅逻辑图像。
If the form of representation is the logical form, then the picture is called a logical picture.
如果这种表现形式是逻辑的形式，那么图像也可以称为一幅逻辑图像。
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