non-defining
adjective/ˌnɒn dɪˈfaɪnɪŋ/
/ˌnɑːn dɪˈfaɪnɪŋ/
(also non-restrictive)
(grammar)- (of relative clauses ) 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-defining relative clause.
非定义：提供有关名词性短语，书面逗号或特定语调的其他信息。在“我的兄弟，住在法国，将和我们一起来罗马”中，逗号之间的部分是一个不确定的相对从句。