So it's not only augmenting materially what you're teaching, but also extends the range of what you can teach in these introductory courses.

所以这不仅仅是物质上的积累,你所教授的东西，更是在延伸,你能讲的内容,在这些入门课程中。

麻省理工公开课 - 媒体、教育、市场课程节选

especially with electronic content, you can reach more people

尤其是电子内容，你延伸到更多的人

不能非法下载 - SpeakingMax英语口语达人