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- 问题详情：Herearetipsforasuccessfulspeechfromaprofessionalspeechwriter：Nospeechshouldlastmorethan20minutes. 36 TheSermonontheMount,acollectionofsayingsandteachingsofJesus,forexample,lastedhardlymorethanthreeminutes.Focusononetopic.We'rehumanandtend...
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