开头用
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First, we're going to ...
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I'd like to begin by outlining our present situation.
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You may not know that ...
中间用
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Let's take a look at some of the implications of this.
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Taking into consideration what we have said about X, we can see that Y ...
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The main reason for these actions is ...
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We have to keep in mind that ... when we consider ...
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As you can see from this graph representing ...
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If you could just take a look at ...
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Looking at X we can see that ..
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There are a number of alternatives in this case. We can ...
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If we had ... , we would ...
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Had we ... , we could have ... Do we need to X or Y?
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I think we can clearly see that we can either ... or ...
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We have been considering ...
结尾用
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We've discussed many points today. Let me quickly summarize the principal points:
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I'd like to quickly go over the main points of today's topic:
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Before we end, let me briefly recap what we have discussed here today.
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Thank you all very much for taking the time to listen to this presentation. Now, if you have any questions, I'd be happy to answer them.
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I think that's about it. I'd like to thank you all for coming in today. Do you have any questions?