Sets the mood. For example, if a serious subject was presented by the previous speaker, the introduction can prepare the audience for a more light-hearted speech to follow.

比如说，上一位出席发言者的主题是严肃的，那么这份介绍将让观众做好准备，去听接下来较轻松的演说。

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A body. It explains why the subject was chosen, why the speaker is qualified to address it, why it is appropriate for this audience and why this time is appropriate to discuss it.

它须能解释该发言人为什么选择这个主题，他具备什么样的资格在此发言，为什么适合受众，为什么适合在此时讨论。

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

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。

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After Commons Speaker John Bercow granted an urgent question on the subject on 18 June 2012, Mr Robertson attacked the decision, which he argued would pave the way for the renewal of the UK's Trident nuclear weapons programme.

BBC: Urgent question: Nuclear-powered submarines

He was a speaker, consultant and author of many books on this subject, including Beyond Survival: A guide for the Business Owner and His Family.

FORBES: A Tribute to a Family Business Legend, Dr. Leon Danco

As a member of the Republican Party, which is generally considered favorable to business and China, and a Mandarin speaker, Ambassador Huntsman is well qualified to speak on the subject.

FORBES: Can China's Relationship With The U.S. Take the Next Step?