I once had a dream, in which I saw rice plants as tall as sorghum.

我曾经做过一个梦，在梦里水稻和高粱一样高。

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I once had a young guy who was a third-year marine biology student at a large state school in Ohio.

我曾经遇到过一个年轻人，他是俄亥俄州一所大型州立学校海洋生物学三年级的学生。

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With the end of my love affair, I lost all the self-confidence I once had.

随着恋情的结束，我失去了所有曾经拥有的自信。

《柯林斯英汉双解大词典》

So once we had the children, Valentine's Day,I think, became more about them.

VOA: special.2010.02.08

It's just the sheer--it's amazing, it's an amazing read too. And then, Marc Bloch; I once had the pleasure when I was giving a talk at the University of Strasbourg and sitting in Marc Bloch's office.

那真的是--真的特别棒,也是本好书,还有马克·布洛克,我曾经有幸在斯特拉斯堡大学演讲时,坐在马克·布洛克的办公室里

耶鲁公开课 - 1871年后的法国课程节选

I had a roommate once who would leave her food out forever

我曾经有一个室友，她总把吃的东西放在外面，

布鲁克林的房价 - SpeakingMax英语口语达人

For example, I once had a boss who would shout requests at me from her office across the hall.

FORBES: 4 Questions You Should be Asking Your Employees

For example, I once had an employee show up over two hours late to work, breathless and slightly upset.

FORBES: I Hate 'It's Business Not Personal'

When I was about fourteen, I once had an argument with my father.

NEWYORKER: A Loaded Gun