More than 2.1 million couples in the United States are infertile, according to the Centers for Disease Control and Prevention.

根据疾病防控中心的数据统计，美国有2.1亿的夫妻不能生育。

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The patients, three married couples and a single woman, came from Britain, the United States and an unspecified country in the Middle East.

包括三位已婚夫妇和一位单身女性的患者来自英国、美国和一个未指明的中东国家。

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Vinod Mishra at Macro International, a research group in the United States, led a study of married couples in Africa.

美国的麦科罗国际研究所的研究人员维罗德·米奇拉在主持一项关于非洲夫妇的研究。

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The study centered on couples between the ages of thirty and forty-four who were born in the United States.

VOA: special.2010.02.19

In the trial, two same-sex couples argue that the state ban violates equal protection rights under the United States Constitution.

VOA: special.2010.02.06

There are about approximately 120, 000 legally married same-sex couples in the United States.

CNN: STORY HIGHLIGHTS

There are about 120, 000 legally married same-sex couples in the United States.

CNN: Gay couple fights for right to marry in epic high court fight

There about 120, 000 legally married homosexual couples in the United States.

CNN: Obama views on same-sex marriage reflect societal shifts