The moon travels round the earth once every month.

每个月都是月亮绕着地球跑。

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In addition to the quiz, we have tests once every month.

除了小测验以外，我们每个月还有一次测试。

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As is known to everybody, the moon travels round the earth once every month.

月球每月绕地球转一周，这是每个人都清楚的。

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Security consultants say a foreigner gets kidnapped, on average,once every other month in the country, with ransom payments for their release reaching hundreds of thousands of dollars.

VOA: standard.2009.09.10

About once every month, the group schedules a large "operation" in which dozens of volunteers descend upon a local neighborhood to do massive group service, such as yard cleanup or a sweeping installation of energy-efficient lighting.

CNN: Fed-up officer says 'enough,' starts senior outreach

Can I go, instead of getting my hair cut every seven weeks, can I go back to getting it done once a week -- or, I mean, once a month or once every three weeks?

WHITEHOUSE: Vice President Biden on Congressman Barton��s Apology to BP

Now people have it once a month or even once every two weeks.

BBC: A gin and tonic is no longer up-to-date malaria protection