教师还需要掌握该专业语言的最新知识，但并不是所有教师都能接触到课堂以外的工作环境。

Teachers also need to have an up-to-date knowledge of that specialist language, and not many teachers are exposed to working environments outside the classroom.

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夏纪梅（2002）的调查也显示，90％的被试教师认为自己在大学英语课堂上的主要角色是“语言讲解者”和“语言示范者”。

The investigation of Ms. Xia Jimei (2002) also shows that 90% teachers consider mat the main role of college English teachers is as a language instructor.

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课堂教学是一种传递知识和信息的过程，而教师的教学语言便是一种传递的主要载体。

Classroom teaching is a kind of knowledge and information transfer process Teachers and the medium of instruction is the transmission of a major carrier.

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