在主位推进模式的使用情况上，中国大学生的即兴演讲与本族语者的电视对话存在很大差异。
There is a great difference between patterns of thematic progression in Chinese EFL learners' impromptu speeches and that in English native speakers' TV talks and public speeches.
成功的即兴演讲往往都有清晰的结构，应有的语步和必须包含的体裁成分。反之，不成功的即兴演讲往往缺少这些条件。
Ineffective impromptu speeches usually lack a clear generic structure and corresponding moves and do not own the obligatory generic elements.
成功的即兴演讲往往都有清晰的结构，应有的语步和必须包含的体裁成分。反之，不成功的即兴演讲往往缺少这些条件。
Ineffective impromptu speeches usually lack a clear generic structure and corresponding moves and do not own the obligatory generic elements.
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