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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). 已經有大量的學者對於課堂教學中的教師用語進行了研究,尤其是以英語作爲第二外語的課堂教學。