Land that was once at the bottom of the sea now lies around the town in wide, fertile fields; where crabs once crawled, donkeys pick their way.

曾经是海底的陆地现在成了城镇周围广阔肥沃的田野；这里曾经有过螃蟹爬行，现在则有驴子择路而行。

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Once the shaking has stopped, do not run out of the buildings at once.

一旦地震停止，不要立刻跑出建筑物。

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I've seen it in the shuttered Windows of once booming factories, and the vacant storefronts on once busy Main Streets.

我见到曾经欣欣向荣的工厂破败不堪的门窗，曾经繁华的街道上空空如也的店铺。

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And so we can thank the American buffalo that once wondered the open plains for this meaning of the word buff.

VOA: special.2009.05.17

Then, once you've done that, once you have secured the integrity and accuracy of the meaning, Hirsch says, "Okay, fine.

在你完成那个之后，一旦你确定了意思的真实性和准确性，赫施说，好的，不错。

耶鲁公开课 - 文学理论导论课程节选

Similarly, divination. Divination is an attempt to discern the future that, once again, heads right to the source of power.

类似的还有占卜术，占卜是一种试图看清未来的法术,它的终极目标，也是神力的源头。

耶鲁公开课 - 旧约导论课程节选

Cardiff and Swansea have played each other twice this season at the Liberty Stadium, once in the Carling Cup and once in the Championship.

BBC: Police operation for derby match

The once lily-white Midwest and the once black-and-white South are becoming prime places for immigrants (eight of the ten states with the biggest growth in the foreign-born Mexican population are in the South, for instance).

ECONOMIST: Lexington

Once the newsfeed is not just news AND once the newsfeed does not include everything that a user has expressed an interest in through friends and likes and subscriptions, then what is it?

FORBES: How Facebook's Empire Of Opacity Is Hiding Posts You Want To See