Part I aimed at giving a introduction of the social and educational background of "the Eight-year Study".

第一部分：“八年研究”的背景。主要论述该项实验产生的社会背景和教育背景。

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An eight-year study of 218 couples found 90 percent experienced a decrease in marital satisfaction once the first child was born.

一项对218对夫妻持续8年的研究发现，90%的夫妻在第一个孩子出生之后，对婚姻的满意度均会下降。

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A large, eight-year study in Europe shows that eating the recommended servings of fruits and vegetables made people only slightly less likely to be diagnosed with cancer.

一个在欧洲持续八年的大型研究表明吃推荐份量的蔬菜水果只能轻微降低人们患癌症的风险。

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

VOA: special.2009.05.27

This was an eight-year study by the FTC which involved 1, 001 consumers and reviewed 2, 968 credit reports.

FORBES: FTC Says 26% Of Credit Reports Have Errors

The eight-year study explored the fundamental question of where disruptive innovations come from and what roles senior executives, managers, and employees play in the creation of highly innovative teams and organizations.

FORBES: We write about the art of innovation

Although this method is considered the gold standard for estimating sodium intake, that lone urine test may not provide an accurate snapshot of the participants' everyday intake over the full eight-year study, as the researchers themselves note.

CNN: Huh? Low-salt diet ups risk of fatal heart attack?