non-defining
US /ˌnɑːn dɪˈfaɪnɪŋ/
UK /ˌnɑːn dɪˈfaɪnɪŋ/

1.
非限定性的
a non-defining relative clause gives extra information about the noun or pronoun it refers to, but is not essential to the meaning of the sentence. It is usually separated by commas.
:
•
My brother, who lives in London, is a doctor.
我哥哥,住在倫敦的那個,是一名醫生。
•
The book, which was published last year, became a bestseller.
這本書,去年出版的,成了暢銷書。