第三人称单数：commentators
1. 解说员;实况播音员
A commentator is a broadcaster who gives a radio or television commentary on an event.
e.g. ...a sports commentator.
体育解说员
2. 评论员
A commentator is someone who often writes or broadcasts about a particular subject.
e.g. ...a political commentator...
政治评论员
e.g. A. M. Babu is a commentator on African affairs.
A. M. 巴布是一位非洲事务评论员。