这表示将为名为id的主键属性创建关系。
This indicates that the relationship will be created for a primary key property named: id.
这表明将为一个静态非主键属性创建关系。
This indicates that the relationship will be created for a static non-primary key property.
可以使用动态关系来关联一组相关业务对象的主键，而使用静态关系来关联非主键属性。
You can use dynamic relationships to correlate primary keys from a set of related business objects and static relationships to correlate non-primary key properties.
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