We saw that books were being turned into e-books, blackboards were being turned into YouTube videos and lecture hall monologues were being turned into MOOCs -- massive online open courses.
只见纸质书慢慢转变为电子书， 黑板渐渐被YouTube视频替代， 讲堂里的讲座变成了慕课—— 大规模的网络公开课。