He only did it the once.

这种事儿他仅仅干过一次。

《牛津词典》

I met him only the once, and that was enough.

我只见过他一次，那就够了。

《柯林斯英汉双解大词典》

"Have they been to visit you yet?"—"Just the once, yeah."

“他们已经去看过你了吗？”— “来过，就那一次。”

《柯林斯英汉双解大词典》

Union troops quickly moved into Richmond.Then they raised the United States flag over the once proud capital of the Confederacy.

VOA: special.2009.12.17

Then, once you've done that, once you have secured the integrity and accuracy of the meaning, Hirsch says, "Okay, fine.

在你完成那个之后，一旦你确定了意思的真实性和准确性，赫施说，好的，不错。

耶鲁公开课 - 文学理论导论课程节选

Similarly, divination. Divination is an attempt to discern the future that, once again, heads right to the source of power.

类似的还有占卜术，占卜是一种试图看清未来的法术,它的终极目标，也是神力的源头。

耶鲁公开课 - 旧约导论课程节选

The once unstoppable green machine lost its mojo at the Climate Change Conference in Copenhagen.

FORBES: The Green Movement's People Problem

MoMA presented the once derided image as the foundation stone of Modernism and turned it into an icon.

BBC: Too famous to see?

The once proud franchise had failed to make the playoffs for six straight years.

FORBES: Magazine Article