vt. 松开，解开,取消，废除,毁灭,扰乱
vi. 撤销
变形：过去式: undid； 现在分词：undoing； 过去分词：undone；
undo可以用作动词
undo指将原本捆绑着的东西打开,如鞋带、包裹等,即“松开,解开”,主要强调解开的动作,而不强调解开的状态。引申可指“毁坏,败坏”。
undo多用作及物动词,后接名词或代词作宾语。可用于被动结构。
undo的过去式是undid,过去分词是undone。
undo用作动词的用法例句
Would you please undo this knot for me？你能不能帮我把这个结解开？
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。
To return a database to its state as of the last committed change, i.e. to undo recent uncommitted changes.使一个数据库返回到它上次已确认的改变之后的状态，即取消最近的尚未确认的变动。
1、If Michael won, he would undo everything I have fought for.
如果迈克尔赢了，那我一直以来努力争取的一切都将白费。
2、once the damage is done, even modern surgery can't undo it entirely.
伤害一旦造成，即使是现代外科手术也无法将其完全消除。
3、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。