This eagerness to transform everything at once was not just youthful ambition.

这种想一蹴而就改变所有问题的热望不仅仅是出于年轻气盛。

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Doing it once was just about excusable — doing it twice was certainly not.

这种事干一次也许还可以原谅，干两次就绝对不能了。

《牛津词典》

Once Tootles began, which was not very often, he had a silly way of going on.

图图不常开口，但他一开口，就会变得十分愚蠢。

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His ideas were so endless that he was not even troubled when he once lost some music he had been writing.

VOA: special.2009.02.08

However, over the course of time, some ancient Israelites, not all at once and not unanimously, broke with this view and articulated a different view, that there was one divine power, one god.

然而随着时间推移一些犹太人，不是全体一致地，摒弃了这种，认同并信仰一种完全不同的，那就是世上只有一个神，上帝。

耶鲁公开课 - 旧约导论课程节选

And it's not a la-di-dah thing where--I'll tell you, once there was a student in there who had really fantastic French and I said, "Why is your French so good?"

其实也不是那么严格要求的,我给你们讲,以前有个学生法语特好,我就问他你法语怎么这么好啊

耶鲁公开课 - 1871年后的法国课程节选

But even Anne Marie seemed happy enough after a while, and if prison was my first not entirely unpleasant exile from the world, then this was my second, and not once was I rec-ognized as the man who burned down the Emily Dickinson House, et cetera, and not once did I hear that voice, the voice inside me that asked, What else?

NPR: Chapter 1

Once again Siri was not only a technological triumph, but a smart business move.

FORBES: The Rise of Artificial Intelligence Could Lead to Apple's Downfall

She sensed at once that it was not so very difficult to make tar, and her careful labor really did help the tarworks.

NEWYORKER: Among Animals and Plants