论文中的解释：
We will call the instances of textual references to objects or abstractions mentions, which can be either named (e.g. John Mayor), nominal (e.g. the president) or pronominal (e.g. she, it). An entity consists of all the mentions (of any level) which refer to one conceptual entity. For instance, in the sentence:President John Smith said he has no comments. there are two mentions: John Smith and he (in the order of appearance, their levels are named and pronominal), but one entity, formed by the set {John Smith, he}.
我们将把文本引用的实例称为对象或抽象提及，它们可以是命名的（如John Mayor），名词性的（如总统）或代词的（如she，it）。一个实体是指一个概念实体的所有提及（任何级别）。例如，在句子中：约翰·史密斯总统说他没有评论。有两个提及：约翰·史密斯和他（按照出现的顺序，他们的级别被命名和代词），但有一个实体，由集合{John Smith，he}组成。
