The first goal of the Foundation was to create computer classes and connect all schools to Internet during three year period.

基金会的首要目标是在三年之内，完成计算机教室的创建，并且通过互联网络将所有的学校连接起来。

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While 71 companies paid over 30% of their profits in federal income tax, 30 enjoyed negative tax rates over the whole three year period.

而71家公司缴纳的联邦收入税超过其利润的30%。30家公司在整整三年期间享受负税。

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Closure of the hospitals was phased over a three-year period.

这些医院的关闭是在三年期间逐步进行的。

《牛津词典》

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

VOA: special.2009.05.27

Others who want to graduate in three years must pay for the same education as four-year students, but in a shorter period of time.

VOA: special.2009.07.23

During this period, there was an average of sixty-three attacks worldwide each year.

VOA: special.2009.06.16

Valuations jump from 15 times earnings to 22 times earnings over a three year period.

FORBES: Should You Secular Market Time?

Moreover, dropping from 10% to 9% to 8% over a three year period is the softest hard landing ever.

FORBES: China Hard Landing Call Getting Crowded Out

We hope to employ two other people than myself and do it in a two to three year period.

BBC: Jersey