commentator

名词 commentator:

1. an expert who observes and comments on something
   同义词：observer
2. a writer who reports and analyzes events of the day
   同义词：reviewer

1. Our commentator will now set the scene in the stadium.
   讲解员现在就要在体育场向我们报道。
2. I prefer soccer commentator to report a match blow by blow.
   我宁愿足球比赛广播实况播音员详尽地报导比赛。

com.men.ta.tor

n.（名词）
A broadcaster or writer who reports and analyzes events in the news.
评论员：在新闻中报告和分析事件的广播员或作家
One who writes or delivers a commentary or commentaries.
注释者：编写或发出一篇评论或多篇评论的人