commentator

/ˈkɑmənˌteɪtər/

an expert who observes and comments on something

中文释义：评论员；解说员

The political commentator analyzed the election results on live television.

政治评论员在电视直播中分析了选举结果。

A sports commentator must describe the action quickly and accurately.

体育解说员必须快速准确地描述比赛情况。