Once upon a time the physical book was a challenging thing.

从前，实体书是一件具有挑战性的东西。

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Her mother once wrote and illustrated children's book, so the family always have plenty to read.

她的母亲曾经写过儿童读物，并且给其配了插图，所以这家人总是有许多书可读。

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He told them to call home once a week and to read at least one book a month.

VOA: special.2010.05.28

Once you know that, get on the phone, get on the Internet, book your tickets.

你们一知道时间，就拿起电话，或者上网，预定回家的票。

麻省理工公开课 - 固态化学导论课程节选

We have a couple of passages, one in the book of Numbers, one in the book of Job, which describe this condition in a way that identifies it with death. An aborted fetus is often not often, it happens once in the book of Job.

有两篇文章，一篇在《民数记》,一篇在《约伯记》里，描述了这种,意味着死亡的状况，比如说，一个被流产掉的胎儿就,但这些例子不多，只在《约伯记》里出现了一次。

耶鲁公开课 - 旧约导论课程节选

Also, I think this book could be an extremely valuable teaching tool and would like to look into using it as such once the book is published.

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Once the book was finished, I spent the better part of a year revising it.

NEWYORKER: Dinaw Mengestu

Once the book was published, who cared what transparent lies you had to tell to save your life?

NEWYORKER: Moon Man