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After that, tests will be done every five years.

在这之后，测试将每5年进行一次。

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The competition was first held in two thousand two and has taken place every two years since two thousand five.

VOA: special.2009.10.27

A cohort study means you take the same group of people and follow them every five years for that period of time.

定群研究意味着你只有一组研究对象,然后在研究期间每五年进行一次记录数据

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Let's say you want to see how something like cigarette smoking is changing in the population and the rates of cigarette smoking, and you want to look at people every five years from 1970 to 2000.

比如你想知道,人群中吸烟者的人数变化,和吸烟者的比例,在1970年至2000年每五年的情况

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Burfoot, now 66, tries to run Boston every five years to celebrate that first victory.

WSJ: Winning Boston Never Felt So Empty

Under Pentagon rules, soldiers in the National Guard can only be deployed once every five years.

NPR: Additional National Guard Troops Set for Iraq

The statute is written so that it must be reapproved, with changes, every five years.

FORBES: Magazine Article