And if you want to test an idea about human nature in general, you aggregate those sets of individual observations into a population study.

同样如果你想测试普遍人性，你可以汇集很多设立在种群研究中的个体观测情况。

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The incident occurred while the research team was conducting a shark population study off Seal Island, near Mossel Bay, on South Africa's Cape coast.

意外发生时，考察队伍正在南非开普海岸莫塞尔湾海豹岛附近进行鲨鱼种群数量研究。

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The study was performed in collaboration with Linköping University, which is conducting a population study called ABIS (All Babies in Southeast Sweden).

这项研究与Linköping大学合作完成，该大学正在进行一个称之为ABIS的人口研究项目（项目涵盖瑞典东南部的所有婴幼儿）。

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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

But you can imagine the inability to do that in a big population study with thousands and thousands of subjects, so we have to rely on data like this.

但你们可以想象在一个大样本研究中,不可能对数以千计的研究对象做这种培训,所以我们需要依靠像这样的数据

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 was only when we started to study those that we actually understood how we can best help that population.

只有当我们开始研究这些,才能了解如何帮助到整体。

哈佛公开课 - 幸福课课程节选

Measles, mumps, and rubella vaccination and bowel problems or developmental regression in children with autism: population study.

FORBES: Anti-Vaccine Activists Apparently Immune To Science

She said there are different ways to determine prevalence and that the CDC is considering a total population study of autism, but that it is not yet under way.

CNN: South Korean study may lead to higher autism estimates

I'd get seven hours of shut-eye a night because a six-year, large-scale population study of sleep done at the University of California, San Diego School of Medicine associated it with the lowest death rate among adults.

CNN: Healthy habits: A month of living perfectly