a done deal, 这个短语的含义不是指“一项完成的交易”，其正确的含义是：

a done deal 制定好的计划，准备好的计划；板上钉钉的事

Although it has yet to happen, reform of the sector is regarded as a done deal.

虽然这个系统的改革还没有开始，但人们认为这是早晚的事。

I thought going to the movies this evening was a done deal but now you say we're not going?

我以为我们今晚去看电影的事已经是板上钉钉的事，但是现在你又说你不去了？

This project isn't a done deal until everybody signs the contract.

直到每个人签了合同，这个项目才是板上钉钉的事儿。

My lawyer says that I shouldn't start dating anyone until my divorce is a done deal.

我的律师说，直到我的离婚时板上钉钉的事我才可以和其他人约会。

Did you see the news? The new bridge is a done deal and they'll start construction in two weeks.

你看新闻了吗？新桥是制定好的计划了，他们两周后就开始建设。

出处：头条号 @饼哥英语口语