及物动词
1. He has undone the good work of his predecessor.
他已毁了他前任取得的良好成就。
2. What's done cannot be undone.
覆水难收。
3. Please undo the package.
请解开这包裹。
4. He undid the parcel.
他打开了包裹。
5. In 5 minutes he undid my whole day's work.
他五分钟就把我花一整天做成的事给毁坏了。
1. 还原：易学易用 - 还原(undo)及改善的面板编辑功能,提高了程式的开发速度. 观看
1. 解开；松开；打开
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.
e.g. I managed secretly to undo a corner of the parcel...
我悄悄地设法解开了包裹的一角。
e.g. I undid the bottom two buttons of my yellow and grey shirt...
我解开了自己黄灰相间的衬衫上最下面的两个纽扣。
2. 撤销；抵消；消除
To undo something that has been done means to reverse its effect.
e.g. A heavy-handed approach from the police could undo that good impression...
警方采取高压手段可能会毁掉之前留下的好印象。
e.g. She knew it would be difficult to undo the damage that had been done...
她知道想要消除已经造成的损害是很难的。
3. 破坏；毁掉
If a person, organization, or plan is undone by something, that thing causes their failure.
e.g. They were undone by a goal from John Barnes...
约翰·巴恩斯的一粒进球使他们落败。
e.g. Macbeth is the story of a Scottish soldier who becomes king but is undone by his own ambition.
《麦克白》讲述的是一个苏格兰士兵当上了国王，却毁于自己的野心。
4. see also: undoing;undone
verb
1. remove the outer cover or wrapping of
e.g. Let's unwrap the gifts!
undo the parcel
Synonym: unwrap
2. cause to become loose
e.g. undo the shoelace
untie the knot
loosen the necktie
3. cancel, annul, or reverse an action or its effect
e.g. I wish I could undo my actions
4. deprive of certain characteristics
Synonym: unmake
5. cause the ruin or downfall of
e.g. A single mistake undid the President and he had to resign