In his speech on Thursday, President Obama challenged those lawmakers who are campaigning to undo his signature domestic issue.

VOA: standard.2010.03.25

The simile sets out to establish the moral polarities between good and evil, but it then works almost systematically to undo that understanding.

这里的比喻开始创造出善与恶之间的,两极性，然而后来它又几乎自动的抹去了这种理解。

耶鲁公开课 - 弥尔顿课程节选

If you really want to be obnoxious, you can do this because really these operators just undo themselves, right?

如果你的确有点反感，你可以这样做,因为这些操作符可以撤销它们自己，对不？

哈佛公开课 - 计算机科学课程节选

Some residents fear no payment can undo the damage.

VOA: standard.2010.06.01

As with the passage on the falling of the leaves there's a kind of elegiac tone that works to undo, or at least to challenge, our theological certainty.

在描写落叶的段落里,有一种挽歌式的腔调，似乎要抹掉，至少是挑战神学上的确定性。

耶鲁公开课 - 弥尔顿课程节选

So you'd have to take that scroll out and undo it.

所以你要把它拿出来并展开。

耶鲁公开课 - 新约课程节选

So even though we're not literally throwing RAM away, we're not physically moving anything, conceptually, we have to go through memory in this order back to back to back and then undo it.

即使我们没有把内存依次扔掉，我们物理上没有移动任何东西，概念地，我们必须按照顺序经过内存,回到这里然后撤销它。

哈佛公开课 - 计算机科学课程节选