The actual level of intensity depends on such factors as the physical layout, population density, and productive activities of a metropolis.

实际的强度水平取决于诸如大城市的物理布局、人口密度和生产活动之类的因素。

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"In the general population today, at this genetic, environmental level, we've pretty much gone as far as we can go," says anthropologist William Cameron Chumlea of Wright State University.

莱特州立大学的人类学家威廉·卡梅伦·楚姆利说：“在今天的一般人群中，在这种遗传和环境水平下，我们已经走到了我们力所能及的程度。”

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One reason to suspect this is that a country's level of Toxoplasma infection seems to be related to the level of neuroticism displayed by its population.

导致这一怀疑的现象有几点。首先，一个国家人口的弓形虫病感染比率似乎和其国民的神经敏感程度有某种联系。

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She explains that the strategy did not work as predicted because of what's called a population level effect.

VOA: standard.2010.03.22

"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

"When you can't say for sure whether all the women in the advance provision group actually used the medication, then you're kind of looking at population level effect of a strategy, not the individual effect of a medication."

VOA: standard.2010.03.22

The General Register Office for Scotland (GROS) said that while the population has fallen, Scotland's share of the UK population has not declined below the level of recent estimates.

BBC: Scotland's population falling

The latest statistics offer a more detailed snapshot of the population in 2011 and a new level of geographical detail relating to the characteristics of those living in England and Wales.

BBC: 138,000 speak no English - census

Mr Gardner reminds us that the growth of the population has been far outstripping the hopelessly inadequate level of new house building, while the number of people in employment has been rising.

BBC: Is the mortgage freeze about to thaw?