And then in the intervening periods, they are on distant learning modules that the students complete.

其余时间，学生通过远程学习模式完成。

哈佛公开课 - 幸福课课程节选

We have 90 extension school students who are taking the course via distance education, so we have a huge group that will be joining us at the 2010 CS50 fair and the those photos you saw a moment ago depicted 2009's.

这里有90个来自哈佛开放学院的学生,他们正在通过远程教育来学习这门课程，所以参加2010年CS50课程的团体是很庞大的,刚才你们看到的图片显示的是,2009年的数据。

哈佛公开课 - 计算机科学课程节选