BrightSpark Education says the online tutoring is used only as an addition to supplement regular teaching.

VOA: special.2011.04.21

So do reach out ultimately to your assigned teaching fellow, to me, to the help list, to the forums online.

所以务必联系到你们的研究生助教，到我这，到那个帮助栏，到在线论坛上。

哈佛公开课 - 计算机科学课程节选

The teaching fellow for each lecture takes what we call scribe notes. These are posted within a few days online.

助教会把每节课讲义记录下来,这些东西几天内就会被发布到网上去。

哈佛公开课 - 计算机科学课程节选