一个精彩的结尾通常有两个组成部分—首先简要地概括一下你演讲中的重点。
An effective closing usually has two components - First you briefly summarize the points you made in your presentation.
你的问题就是你无法从演讲中概括出重点。
Your problem is that you can't summarize the important points from the lectures.
概括你的演讲；
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