英 [ʌnˈduː] 美 [ʌnˈduː]
v. 解开，松开；消除……影响或结果，使恢复原状；撤销（先前的计算机指令）；破坏，毁掉
n. （计算机）撤消还原
复数undos
第三人称单数undoes
现在分词undoing
过去式undid
过去分词undone
undo /ʌnˈduː/ CET4 TEM4 [ undoing undid undone undoes ]
及物动词 If you undo something that is closed, tied, or held together, or if you undo the thing holding it, you loosen or remove the thing holding it. 打开; 解开; 松开
I managed secretly to undo a corner of the parcel.
我设法偷偷地打开包裹的一角。
I undid the bottom two buttons of my yellow and grey shirt.
我解开了我黄灰色相间衬衫最下面的两个钮扣。
及物动词 To undo something that has been done means to reverse its effect. 使无效
A heavy-handed approach from the police could undo that good impression.
警察的专制手段能使那个好印象化为乌有。
She knew it would be difficult to undo the damage that had been done.
她知道难以挽回已造成的损失。
→see alsoundoing
cancel, annul, or reverse an action or its effect
I wish I could undo my actions
deprive of certain characteristics
同义词： unmake
cause the ruin or downfall of
撤销-引用次数：6
撤消
取消
废除
解开
撤销
还原
重做（Redo）和撤消（Undo）是Oracle的重要特性，用以保证事务的可恢复性和可撤消性。本章将对Oracle的重做机制进行讨论。
...进入）： 退出vim（常用）：普通模式下退出vim：普通模式下输入Shift+zz即可保存退出vim 普通模式下删除文本： 替换和撤销(Undo)命令（只针对普通模式）： 快速缩进（缩进操作均在普通模式下有效）：使用命令进行快速调整缩进操作：通模式下输入15G，跳转到15...
三、基本编辑方法 1、 取消（Undo）：在Command：提示符下用快捷命令U 并回车 即可取消刚刚进行的误操作命令，此键U 又称为后悔键。
He tried to undo the knot by picking at it with his fingers.
他用手指不停地扯，想把绳结解开。
The knot was fastened in such a way that it was impossible to undo.
那个结系死了，没法解开。
Oh, do let me help to undo it!
哦，让我帮你解开它吧！
"What we don't want is a situation where parents are taking all the right steps at home, and then their kids undo all that work when they go to school with salty,fatty foods in the school cafeteria."
VOA : special.2010.06.07
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。
弥尔顿课程节选 : 耶鲁公开课
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？
计算机科学课程节选 : 哈佛公开课
In his speech on Thursday, President Obama challenged those lawmakers who are campaigning to undo his signature domestic issue.
VOA : standard.2010.03.25
Some residents fear no payment can undo the damage.
VOA : standard.2010.06.01
New bureaucrats are hired to try to undo the damage caused by existing bureaucrats.
FORBES: We Don't Need TAG Accounts, We Need Sanity At The Fed
Yet both Sky and the Premier League may be kicking up an undo fuss.
Our real economy is growing again, but too slowly to undo the damage of 2008-2009.
"undo"是个多义词，它可以指undo（英文单词）,undo（Rush of Fools单曲）,undo（ORACLE数据信息）,undo（sanna nielsen演唱歌曲）。