Once you know what pieces to look for, what mental constructs to reach for, can you realize all right I want to make some dancing figures go back and forth, I need to loop this way and loop this way and check if I'm on the edge and so forth.

一旦确定需要查找的部分,想要达到那种层次，你是否意识到,我想做出一些可以来回走动跳舞的人，我需要按这种方式那种方式让它转圈,并检查我是否,到了屏幕的边缘等等。

哈佛公开课 - 计算机科学课程节选

So, let's listen to this bit of klezmer music go back and forth between minor and major.

让我们感受下这段犹太音乐,它在小调和大调之间转换

耶鲁公开课 - 聆听音乐课程节选

John Now, you're going to hear John and I go back and forth a lot, well I'm certainly old time, but I'm also an old time Lisp programmer.

现在，你会听到我和,来回的讲好多次，好吧我当然是个老学究，但是我也是一个老lisp程序员。

麻省理工公开课 - 计算机科学及编程导论课程节选