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Explanation:

To produce a coherent and potentially powerful 20-minute speech, it is ideal for the speaker to focus his speech on a central idea that is aligned with the interests and profile of his audience. There are some strategies that make communication more effective and focused, one of them is to share personal experience on the subject to be addressed focused on an innovative and powerful vision.

To make an impact on speeches, some emotional triggers can also be used, such as the use of questions that lead the audience to their own reflections that make them focus on what is being said in the speech. It is also important that the speaker does not forget to use non-verbal language resources such as gestures, body posture, tone of voice, etc., to captivate the audience and retain attention.

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Answer:

To begin, keep in mind that in a 20-minute speech, you should only present one topic, tell one anecdote, and ask one question.

Explanation:

Resisting the impulse to say too much is the trick to expressing anything noteworthy in 20 minutes. First of all always remember, in a 20-minute speech, you should convey one topic, share one anecdote, and pose one question.

Now let us narrow down things that we should always keep in mind while preparing for a powerful 20 minutes speech.

  • Begin by deciding on a single concept. Make it a concept that has broad appeal, but where your individual experience can be put to good use. Then, pare it down and focus it till you can simply summaries it in a few phrases in an elevator pitch like

"I am a scientist and a teacher who studies complicated and advanced            chemistry and has the opportunity to teach it. I've been doing this for almost 20 years and also have a lot to say about it."

  • After that, choose one tale to match with the one concept. Make it a narrative that only you know how to tell. Make it a lesson or a narrative with a message. It's important to keep in mind that your experience doesn't have to be as dramatic or life-threatening as others.
  • Last but not least, pose a question. A good lecture asks a question that has an answer which can be sketched up briefly at the start of the talk, but that the talk itself is the whole response. Make it a big question if you want to.

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https://brainly.com/question/15526383