Researchers have been studying two groups of men in the United States of America (USA) with one primary aim – to discover what it takes to live well.

在美利坚合众国（美国），在如何才能生活得好这样一个基本目标下，研究人员一直对两组对象同时进行研究。

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There are no reliable global prevalence figures, but a 2005 study estimated a global incidence of 0.97 per 1000 live births based on research in the United States of America (USA).

目前尚无可靠的全球发病率数据，但2005年的一项研究显示，根据美国的研究，全球的发病率为每1000例活产0.97人。

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Let's pretend that our sister Jane is getting married on June 3 in Orlando, Florida, USA, and we live in San Diego.

让我们假设Jane姐姐将于6月3日，在美国佛罗里达州的奥兰多结婚，而我们住在圣地亚哥。

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And to watch live coverage of the Inauguration on Tuesday, go to our Web site, voaspecialenglish.com and click on USA Votes 2008.

VOA: special.2009.01.16

When an old friend moved to Huntington Beach,California - a Pacific coast city nicknamed Surf City,USA - he realized it was time to live his dream.

VOA: standard.2010.08.04

All of us born in the USA are lucky to live in a country where we are given the right to vote.

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While specific states within USA differ a lot, people that live in LA consider themselves to be the same nation as those living on the east coast.

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His connection was not fast enough to view the live stream of his identical twin Kevin competing in the USA at midnight and he wondered whether he could watch it in my room.

BBC: Borl��es aim to make 2012 a family outing