非限制性定语从句在意义上是先行词的一个附加修饰语,对先行词只起进一步说明的作用,有时对整个主句做进一步的说明。如果删掉它,整个句子的基本意思是完整的,因此通常用逗号把它和主句分 The non-restrictive attributive clause is an additional modifier of the antecedent in the sense of meaning. It only plays an additional role in explaining the antecedent, and sometimes it further explains the entire main clause. If you delete it, the basic meaning of the entire sentence is complete, so usually it is separated by a comma and the main sentence.