So you can scroll back through your history, which is also useful for time's sake.

所以我们可以滚回到我们的历史记录，这个可以节约我们的时间。

哈佛公开课 - 计算机科学课程节选

It's too early to tell what the impact on learning will be from open course ware but we know from messages people have sent us that educators see tremendous value in being able to use the site to build work upon others.

现在还不好说,但是通过人们发来的邮件我们知道了,教育者对于能够在别人的基础上,展开自己的工作给予很高赞扬,他们现在可以节约下时间。

麻省理工公开课 - 媒体、教育、市场课程节选