An English as a second language specialist joins the class for some lessons.
一位母语为非英语的专家也旁听了很多次课。
Others, such as PS 20 on the Lower East Side, have opted for dual-language programs, where half of the class is fluent in English and the other half is fluent in Mandarin.
而位于下东区的PS 20等其他学校则选择了双语课程，班上一半的学生英文流利，另一半则精通普通话。
The research on teacher talk, especially English as teacher talk in English class, is important for English teaching practice and studies of pedagogy.
因此，以英语为主的教师语的研究对英语教学实践和教学法研究都是极其重要的。
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