I'll never ever do that again!

我再也不会干那种事了！

《牛津词典》

"If he ever gets angry at me, I'll never go and see him again," said Mary.

玛丽说：“如果他生我的气，我就再也不去见他了。”

youdao

I will... never ever drink that much whiskey again in my life.

我……我将永远也不再喝这么多的威士忌了。

youdao

We have to move as quickly as we possibly can to make sure this never ever happens again.

CNN: Solicitor General Ted Olson

This must never, ever happen again.

CNN: Jackson: Candidates 'represent hope and healing'

As an American president, we can never, ever allow again a major city, a major population center in our country go through what New Orleans, what the Gulf states did as a result of the kind of neglect from an American president.

CNN: Part I: CNN/YouTube Democratic presidential debate transcript