我不小心发了错误的邮件，但很快撤销了发送。

I sent the wrong email by mistake, but quickly ___undid the action.

我花了好几分钟才解开这条项链的扣子。

It took me several minutes to ___undo the clasp of this necklace.

他的骄傲最终毁了他的大好前程。

His pride eventually ___undid his bright future.