commentator noun
1 person who commentates on sth
ADJ. cricket, football, rugby, sports, etc. | match, race | radio, television/TV > Note at JOB
2 person who gives opinions on sth in the media
ADJ. influential | independent | foreign | media | cultural, economic, political, social Political commentators are predicting that the minister will have to resign.
PREP. ~ on a commentator on current affairs
You can also check other dicts: commentator (English, 中文解释 ), wordnet sense, Collins Definition