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duty today to... iamp。39。ve been asked to... 告知演講的話題 the subject of my presentation is... i shall be speaking today about... my presentation concerns... todayamp。39。s topic is... today we are here to give a presentation on... today we are here to talk about...before we start, iamp。39。d like you meet my team members... a brief look at todayamp。39。s agenda...(告訴聽(tīng)眾所講內(nèi)容的先后順序