Referential choice in narrative discourse is mainly affected by three factors: referential distance, ambiguity of referential expressions, and the relationship between referents and focus of a topic.
叙述语篇中的指称选择主要受到三个因素的影响：指称距离，指称对象是否引起歧义，指称对象与话题焦点的关系。
It is also a sound choice if you want to use database referential integrity to enforce associations.
如果你想用数据库的引用完整性来做关联，那它也是个合适的选择。
It is also a sound choice if you want to use database referential integrity to enforce associations.
如果你想用数据库的引用完整性来做关联，那它也是个合适的选择。
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