So, you know, I actually paused and tried to lend a hand with this and what struck me at the end of this experience of walking this individual through the process of buying a ticket was actually a recurring theme in my mind for this course.

所以，你们懂的，我停下来帮助了她,令我惊奇的是,这次买票的经历,正是我们这次课程的,一个主题。

哈佛公开课 - 计算机科学课程节选

I'm reminded of the confirmation screen here and that's not too bad, then we put in the card and we click confirm and then finally we see the swap Then finally literally nine steps later the ticket comes out of the machine and then, frankly, had to go through the process of where to put the ticket in the machines.

这里出现了确认画面,那还不是太坏，然后我们把卡插进去,点击确认，然后我们看到了那个,函数。，swap，function。,【笑声】然后最终经过9个步骤,票从机器中出来了，然后，需要找出从哪里,把票放到机器中去。

哈佛公开课 - 计算机科学课程节选