So Q4 covers homework 4, otherwise there is some confusion later on.

所以第四次家庭作业还是4个问题，不然以后会造成困惑。

麻省理工公开课 - 固态化学导论课程节选

And I think our time is about up, so we'll listen to this and you can go out as we hear the fourth statement of this.

我想我们的时间快要结束了,我们一边听就可以一边走了,我们听到的是第四次表达

耶鲁公开课 - 聆听音乐课程节选