I'd never have thought of that in a million years.

我永远也想不出这个主意。

《牛津词典》

You'd never guess in a million billion years. — a jumping rope!

就算是上百上亿年，你也不会猜的出来…一根跳绳！

youdao

"[They] work for 20, 25, 30 years and retire, " Sanchez says. "And I think never in a million years did they expect to be in their 50s job-searching and starting all over again."

米切尔.桑切斯说：“他们会工作20年、25年或者30年后退休；我想他们从来没有考虑在21世纪，也就是他们年过50岁之后还会再找工作，一切从头在来。”

youdao

"I've known Bredon Hill for 20 years and taken my metal detector there countless times, so never in a million years did I expect to come across such a find, " Mr Carpenter said.

BBC: Bredon Hill Roman coins unveiled at Worcester museum

We would never in a million years consider circumcising a girl, so why should we do so to our son?

CNN: Circumcising our son -- How do we decide?

Of course, most bands could never in a million years hope for the kind of deal Pearl Jam has laboriously worked out.

NPR: Pearl Jam, Playing A Business Deal By Ear