In Norway, after an intervention campaign was introduced nationally, an evaluation of forty-two schools suggested that, over a two-year period, bullying was halved.

在挪威，一项干预运动在全国推广后，对42所学校的评估表明，在两年的时间里，欺凌现象减少了一半。

youdao

A new study found that inner-city kids living in neighborhoods with more green space gained about 13% less weight over a two-year period than kids living amid more concrete and fewer trees.

一项新的研究发现，在两年的时间里，与住在钢筋水泥更多、树木较少的社区的孩子相比，住在市中心有更多绿地的社区里的孩子，两年中增加的体重少了约13%。

youdao

The participants were assessed at four different times over a two-year period for depressive episodes, depressive symptoms, sleep quality and chronic medical disease.

在超过两年的时间内的四个不同时期下对被试的抑郁发作，抑郁症状，睡眠质量和慢性内科疾病进行评估。

youdao

The study examined employment records for eight cities in Minnesota for a three-year period through two thousand six.

VOA: special.2009.05.27

Over that eighty-one year period you would have gotten a multiple of seventy-two.

经过81年时间,你翻了72倍

耶鲁公开课 - 金融市场课程节选

The researchers studied the diets of thirty-one thousand children ages two to eighteen over a thirty-year period.

VOA: special.2010.03.17

This is legislation that, as you know, is a two-year bill and spends out over that two-year period -- two fiscal-year period of time.

WHITEHOUSE: Press Briefing

The Sarbanes-Oxley Act of 2002, Section 203, imposed a five-year rotation and five-year cooling-off period, from a seven-year rotation with a two-year cooling-off period.

FORBES: KPMG's Inside Trader: What The Auditor, and Skechers, Don't Want To Talk About

But both Stretch and Zerbe have an answer to that: Include tax breaks that would put cold cash now in many businesses' hands--for example, an extension of the now-two-year-period in which business can carry back their net operating losses.

FORBES: Obama's Tax Choices