你需要撤销那个更改。

You need to ___undo that change.

我很高兴可以撤销删除我邮件中那段文字的操作。

I'm glad I can ___undo deleting that paragraph in my email.

我不小心删除了图表，所以不得不快速撤销这个操作。

I accidentally deleted the chart, so I had to quickly ___undo the action.