约翰逊教授，昨天晚上我对我的论文做最后的润色时，电脑发生故障，我的文件全被清除了。你能不能再给我一天时间，把它重新打一遍？

Professor Johnson, last night when I was putting the finishing touches on my paper, a computer failure completely wiped out my files, do you think I can have another day to retype it?

youdao

So, let's see this eraser actually never works very well so I'm just going to draw below it.

这个清除器不能很好地运行,我将在下面画出它。

哈佛公开课 - 计算机科学课程节选