He had an extraordinary memory, and when once he got hold of a fact it never escaped him.

他有极强的记忆力，只要他掌握了情况，就从不忘记。

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At Chinese New Year, when once he would go home to visit his son, Fang must stay behind because the restaurant is so busy.

以前春节，他都要回家看儿子，但今年，他必须留守厨房，因为餐馆生意太好了。

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Megan didn’t know this when once, in aheroic, or perhaps exhausting attempt to impose time-outs, Megan sat Ryan on achair and then physically restrained him for the three minutes.

梅根对此并不了解，有一次不知是出于狠心，还是出于无奈，她试图对儿子实施强制隔离。 她让赖安（Ryan）坐在椅子上，然后按着他在椅子上待了三分钟。

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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

Another thing is that, when once an invention is made, it tends to be copied all over the world.

另外，一旦一个发明诞生，它就会被模仿并应用于世界各地。

耶鲁公开课 - 金融市场课程节选

So whether we finish it today, or more likely when we finish it up on Friday, once we get passed isoelectronic atoms, that's it, that's all you need to study for this first exam.

因此，我们也许今天讲完，或者更有可能周五讲完，无论如何，就到我们讲完等电子原子为止，这是你们第一次考试所需要准备的全部内容。

麻省理工公开课 - 化学原理课程节选

The breaking straw was when once, in a management review, we met with the oldest head of a business.

FORBES: Kindness At The Office

It often has to settle for being co-underwriter, when once it would have been the lead underwriter.

ECONOMIST: Investment banking

And history, in such circumstances, has not been good to Rangers when once Walter Smith took his previous leave of the club in 1998.

BBC: Chick Young's view