undo

/ʌnˈduː/ v.
标准词条 CET-4
一句话记住

解开；打开（纽扣、结等）；撤销；消除……的影响

释义与例句

v. 解开；打开（纽扣、结等）
to open or unfasten something that was tied, buttoned or fastened
  1. Can you undo the top button of my coat for me?
    你能帮我解开大衣最上面的纽扣吗？
  2. She carefully undid the knot and opened the parcel.
    她小心地解开绳结，打开了包裹。
展开其余 1 条例句
  1. He undid his seat belt after the car had stopped.
    汽车停下后，他解开了安全带。
v. 撤销；消除……的影响
to reverse the effect of a previous action or return something to its earlier state
  1. You can undo the deletion by pressing Ctrl and Z.
    你可以按 Ctrl 和 Z 撤销删除操作。
  2. Nothing can undo the damage caused by years of neglect.
    什么都无法消除多年忽视造成的损害。
展开其余 1 条例句
  1. A single careless remark undid all his efforts to rebuild trust.
    一句欠考虑的话使他重建信任的所有努力付诸东流。

词源与构词

记忆钩子 undo 的过去式是 undid，过去分词是 undone；undo a button 是“解开纽扣”，undo a change 是“撤销更改”。

词族与关联词

同义词
  • reverse 使反转；撤销
    undo 专指解开系好的东西，或撤销先前的操作、消除其影响；reverse 范围更广，还可指倒车、颠倒顺序或彻底改变趋势，不能替代 undo a button。
    She reversed the car into the garage. 她把车倒进了车库。
易混词（形近或义近，注意区别）
  • redo 重做；恢复已撤销的操作
    undo 是撤销上一步；redo 在软件中是把刚撤销的操作重新执行，也可泛指重新做某事。二者不是简单的“做”与“不做”。
    I accidentally deleted the paragraph, undid the change, and then redid the deletion. 我误删了一个段落，撤销后又恢复了删除操作。
常见搭配
  • undo a button 解开纽扣
    It was so warm that he undid a button on his shirt. 天气很热，他解开了衬衫上的一颗纽扣。
  • undo a knot 解开绳结
    She used a pin to undo a knot in the thread. 她用一根针解开了线里的一个结。
  • undo the damage 弥补或消除损害
    The company apologized in an attempt to undo the damage to its reputation. 公司作出道歉，试图挽回其声誉受到的损害。