Most Middle Eastern countries have extremely high rates of population growth.

大部分中东地区的国家都有着极高的人口增长率。

《柯林斯英汉双解大词典》

Low average population densities are characteristics of most underdeveloped countries.

平均人口密度低是大多数不发达国家的特点。

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During the same period, the population of Jurania increased by 6 percent, in part due to immigration to Jurania from other countries in the region.

同一时期，Jurania 的人口增长了6%，部分原因是来自该地区其他国家的人们移民到 Jurania。

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The study says the elderly are nine percent of the total population of low and middle income countries today.

VOA: special.2009.12.28

The ratio of nurses to population is about ten times higher in the United States and countries in the European Union.

VOA: special.2010.06.07

In other words about the same as the downsized population of countries like Ireland.

FORBES: How to Downsize Yourself

The research by Dr. Snowdon and others, though, suggests using thresholds of 27 and 32, respectively, for Samoans and the population of some neighboring countries would give a more realistic view of the risks they face of diabetes and other diseases associated with obesity, researchers say.

WSJ: Island Where Obesity May Not Be All It Seems

The population of most developed countries, the United States in particular, is aging.

FORBES: The Right Funds for This Environment