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Research on teachers'talk in EFL classroom teaching has been conducted by a lot of linguists (Chaudron, 1998; Duff & Polio, 1990 and Harbord, 1992). 已经有大量的学者对于课堂教学中的教师用语进行了研究,尤其是以英语作为第二外语的课堂教学。