There's a little video player on the right side of The screen that allows the student or the professor Teaching from these materials to bring up those Materials and show the students. So this allow The students to explore materials on their own.

屏幕右边有个小放映机,能让学生和用这些资料教学的教授,提取出这些媒体资料,并播放给学生看,这允许学生自己发掘资料。

麻省理工公开课 - 媒体、教育、市场课程节选