Newly developing countries are beginning to industrialise, primarily in Africa, with high to very high population growth rates, and characterised by a predominantly young age profile.

新发展中国家正在开始工业化，主要是在非洲，人口增长率一再提高，以年轻化为显著特征。

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The region has a very high population density.

这一地区人口密度很高。

《柯林斯英汉双解大词典》

Crown of thorns starfish normally live in high population densities.

刺冠海星通常生活在聚居的环境中。

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"If people are not able to enhance their skills in various medical specialties, therefore they cannot provide the high level of health care and services that the population needs."

VOA: standard.2010.06.01

All tended to have a high slave-to-free ratio of population.

人口中奴隶所占的比例 都是非常高的

耶鲁公开课 - 美国内战与重建课程节选

When you look at the risk of consequences from metabolic syndrome in the population, you have to know a person's race to some extent to understand how high their risk really is.

如果想要考察某人群,患代谢综合征的风险,就要知道一定的种族信息,这样才能较准确地知道他们的患病风险度

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

It has a dangerous mix of poor sanitation, high population density and limited health services.

BBC: UK to spend ?2m combating cholera in Sierra Leone

States with high population of the disadvantaged groups also show that they are under-represented in ownership of businesses.

BBC: Caste and entrepreneurship in India

Like the U.S., China is expected to have a high population of retirees and a smaller number in the working-age population.

FORBES: China Hard Landing Call Getting Crowded Out