(of relative clauses )关系从句 giving extra information about a noun phrase, inside commas in writing or in a particular intonation in speech. In ‘My brother, who lives in France, is coming to Rome with us’, the part between the commas is a non-restrictive relative clause. compare restrictive非限制性的; 非限定的 Oxford Collocations DictionaryNon-restrictive is used with these nouns:- clause