Media theories of distance education: element, assistance or focus?
远程教育媒体理论：要素，辅助，还是中心。
Educational technology is an essential element in modern distance education.
教育技术是现代远程教育的基本要素。
The long run is also an important element for middle distance runners.
长距离跑也是中距离跑的重要元素。
The long run is also an important element for middle distance runners.
长距离跑也是中距离跑的重要元素。
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