"Children need the interactive back-and-forth.

VOA: standard.2010.05.05

And then he goes back to hell and then back up to heaven -goes back and forth between these two rhythmically very different concepts.

然后它回到了地狱,接着又升到了天堂,在这两种节奏非常不同的概念之间,来回往复

耶鲁公开课 - 聆听音乐课程节选

And then, they have this very complicated back-and-forth about things that they remembered, or didn't, and they hashed these things over: Then Carlo asked Dean if he was honest and specifically if he was being honest with him in the bottom of his soul.

于是，他们有了这个十分复杂的,关于他们想得起来想不起来的事的来回选择，并且他们充分讨论了这些事情：,然后卡洛问迪恩他是否诚实，特别是他是否,从灵魂深处对他诚实。

耶鲁公开课 - 1945年后的美国小说课程节选

We don't have to worry about how you solve it, but it's problem in mathematics and the answer will be--surprise, it's going to be oscillating back and forth and that'll come out of the wash.

我们没必要去担心这个方程该怎么解,但这个数学问题的答案将会是令人惊讶的,弹簧会来回振荡,问题就迎刃而解了

耶鲁公开课 - 基础物理课程节选

that is,people who were administered,who are governed, but in the sense of having people passing papers back and forth, and having to sign every damn thing you could ever imagine- it's just unbelievable-- before they ever thought of themselves as being citizens.

也就是被治理者,被统治者,不过让人们来回奔忙为了申请批准,还要在每一份该死的文件上签名,从这个意义上来说,在他们视自己为公民前,这是令人难以置信的

耶鲁公开课 - 1871年后的法国课程节选

These memo-ons just go back and forth.

这些，memo-ons来回反复运动。

麻省理工公开课 - 固态化学导论课程节选