This year, only a single case of polio was reported, in January, from what we know is the world's most technically challenging area for the interruption of transmission.

据我们所知本区域是从技术角度而言阻断传播最具挑战性的区域，而一月份报告的脊灰病例是今年唯一的一例脊灰病例。

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It wasn't until a few years into a search for an explanation for AIDS that a team in Paris (and a year later a team in the U.S.) isolated the virus we now know as HIV.

没过多久为了解释AIDS的一只巴黎团队(随后一年后一只美国团队)分离的病毒，即我们现在知道的HIV。

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CAROLYN: Probably good prices. You know we will only be in America for about a year.

凯洛琳：便宜的好了，我们大概只在美国待一年。

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Our economy is growing for the first time in more than a year, and we know that economic growth is a prerequisite for job growth.

WHITEHOUSE: President Obama Speaks to Press After Cabinet Meeting

We know that this year has not been a good one for the Chinese wind power industry as growth slowed dramatically.

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We now know that the economy has been growing for the better part of a year.

WHITEHOUSE: President Obama on April Jobs Numbers