It is a moment to consider the rapid growth of a site whose 400m-plus users outnumber the population of any single country except India and China.

对于这样一家拥有逾4亿用户（超过除印度和中国以外任何一个国家的人口总数）的网站，人们是时候仔细琢磨一下它的快速增长了。

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A limitation of green power generation is that wind farms and large-scale solar panels are easier to site in remote areas, leaving a challenge in taking energy to centres of population.

绿色发电的制约是风力发电场和大规模的太阳能电池板更方便设置于偏远地区，而将能源传输到人口密集地区比较困难。

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Even with a tremendous research budget, you have only looked at a portion of the site and reached a specific part of the visitor population.

即使你的研究预算很富裕，你也只能够观察到网站的一部分，和用户群中某几类用户。

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So more than doubling the risk can certainly site to the population Now these kind of results show how important it is to do studies that don't group everybody in the population together.

由图可见,发病率差异量超过一倍,这些研究结果表明,在研究过程中分组的重要性

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

This is the site of Wales' greatest growth in population - a rise of 23.2%.

BBC: Census graphics

The researchers believed as many as 4, 000 people gathered at the site, at a time when Britain's population was only tens of thousands.

BBC: Stonehenge builders travelled from far, say researchers

By the 1970s there were no reports of a wolf population, according to the park's Web site.

CNN: Planet in Peril: Environmental Coverage - Special Reports from