The right orientation of teaching purpose is the key element in the raising of teaching quality.
教学目的的正确定位是教学质量提高的关键因素。
The research of the teaching space-time, which is as a key element of classroom teaching, has a long history.
教学时空作为课堂教学的重要元素，人们对其研究已有较长历史。
Constructing course is the key element of teaching and learning quality engineering.
课程建设是教学质量工程的核心要素。
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