很高兴介绍今天的主讲人，哈特博士。

It is pleasure to introduce the keynote speaker for tonight, Dr. Hart.

您可以在您的同龄人作为主讲人的事件。

You can get in front of your peers as a speaker at an event.

上海电视大学知名历史学教授、CCTV百家讲坛主讲人鲍鹏山则认为这场辩论太过复杂。

Bao Pengshan, a well-known history professor at Shanghai TV University and a speaker at CCTV’s Lecture Room, believes the debate is a complicated one.

介绍词应至少包含四方面的信息：主题是什么；为何选这一主题；主讲人是谁；为何由他主讲。

The introduction should give at least four pieces of information: what is the topic, why this subject, who is speaking, and why this speaker.