Once when we were going to Paris, I forgot my passport.

有一次我们去巴黎时，我忘了带护照。

《柯林斯英汉双解大词典》

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Parson Walker's wife was very sick once, for a long time, and it seemed as if they were not going to save her.

VOA: special.2009.08.29

You're hiding something from yourself, and once you know what's going on to deeper phenomena your problems will go away.

这些冲突被你压抑起来，一旦你理解了更深层次的冲突究竟是什么,你的问题便会得到解决。

耶鲁公开课 - 心理学导论课程节选

We've argued that once we realize those aren't going to be played, that 2 and 9 aren't going to be played.

我们明白了一旦我们知道了,无人会采用那些策略时,那么也没有人会选立场2和9

耶鲁公开课 - 博弈论课程节选

So if you go once a week now, you're only going once every two weeks.

WHITEHOUSE: Press Briefing by Deputy Press Secretary Josh Earnest

The big question: Where in the heck would this enormous crown of thorns be going once the Bible Experience no longer had a use for it?

WSJ: Promoting 'The Bible' With Crown of Thorn

At the same time, their brains were scanned with positron emission technology (PET), using a radioactive compound that allowed the researchers to visualize where caffeine was going once it arrived in the brain.

FORBES: A Snapshot of Caffeine's Fascinating Effects On The Brain