She has been beaten only once in six starts.

她参加了六次比赛，只败过一次。

《牛津词典》

youdao

Ann wore it only once.

安只穿过它一次。

youdao

After the concert he said: "She has a voice that one hears only once in a hundred years."

VOA: special.2009.01.25

There we go. Now if I do this, an infinite number of times, we should get roughly 50/50, but now we have the ability to do things only once in awhile.

开始，如果我们，不停地按这个按钮，我们大致会有一半的机会听到猫叫，但是我们每次只有一次按按钮的机会。

哈佛公开课 - 计算机科学课程节选

It's a comedy that you only get once you performed and once you know what's happening, and

这种喜剧只有你自己明白，只有你自己知道发生了什么，

街头表演很有趣 - SpeakingMax英语口语达人

In that time, only once do I remember anyone questioning whether it was right to film human remains.

BBC: Fallen soldiers: Is it right to take images of bodies?

Sergio Garcia, the 2008 champ, has won only once on Tour since cashing at TPC.

WSJ: Players Championship: The Major That Isn't Yet Major

If they do, they usually say that they had this experience only once or twice.

NEWYORKER: Seeing and Believing