She swore (that) she'd never seen him before.

她明确表示自己以前从未见过他。

《牛津词典》

I've never seen him get mad or lose his temper.

我从未见过他发疯或发火。

《柯林斯英汉双解大词典》

I'd never seen a clumsier, less coordinated boxer.

我还从未见过更加笨拙、更不协调的拳击手。

《柯林斯英汉双解大词典》

You never seen a frog so honest and simple as he was, for all he was so skilled.

VOA: special.2009.08.29

I've read through the same thing twenty times and I've missed something obvious. Someone who's never seen it before looks at and says, did you really mean to do this?

但是它们有一双旁观者之眼,我把同一段代码读上20遍,都会漏掉一些很明显的错误，从没看过这段代码的人会告诉我？

麻省理工公开课 - 计算机科学及编程导论课程节选

What this basically means is, you're given some problem to solve, that you've never seen before.

我们还会再讲讲这些内容,最基本的意思就是你有一个问题要处理。

麻省理工公开课 - 计算机科学及编程导论课程节选

"I have never seen it happen that a boss can work through a second-in-command, " says Xavier.

FORBES: Magazine Article

To support this very dinamic environment, teaching people to think, tackle even problems never seen before.

FORBES: Hunting Multicultural Talents for big revolution in business

Aides to the subcommittee said they have never seen a company employ such a complex structure.

WSJ: Apple Pays No Tax on Much of Its Overseas Income, Senate Panel Finds