In the history, there have been two different traditions of distance education: distance classroom teaching and correspondence teaching.
历史上有两种传统的远程教育：远程课堂教学和函授教学。
In the history, there have been two different traditions of distance education: distance classroom teaching and correspondence teaching.
历史上有两种传统的远程教育：远程课堂教学和函授教学。
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