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作者在文章中介绍了演讲的三个要素,包括演讲之前的准备工作,演讲中必要的视觉教具以及在现实生活中如何进行演讲。
In the article, the author introduces the three elements of the speech, including the preparatory work before the speech, the necessary visual aids in the speech and how to make a speech in real life.