The test gives an indication of ageing within population groups, but does not accurately measure the life expectancy of an individual, because of natural differences in telomere length.

这项测试给出了关于人群组的老化的印证，但是却没有因染色体端粒的自然差异，确切的测量出一个人的预期寿命。

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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 systematic application of a screening test in an asymptomatic population.

在无症状的人群中有条理地应用筛查检测。

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Some want an independent review. And the trial's researchers, like Dr.Nelson Michael, of the Walter Reed Institute of Research in the United States, say it's unclear what difference the findings will make for areas like Africa where rates of HIV/AIDS are much higher than among the test population and where there are many strains of the virus.

VOA: standard.2009.10.20

You have to test it by giving the vaccine to a large population of people, and then watching and seeing if you've reduced the incidence of the disease.

这样的测试的做法只能是,给大量人群分发疫苗,接着观察和了解,这种疾病的发病率是否有所降低

耶鲁公开课 - 生物医学工程探索课程节选

They called for improved diagnostic tests, and larger population studies to test the theory further.

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As a public company, it got too much pressure to become profitable for it to further reduce an already small patient population with a diagnostic test.

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The RNIB says that children under 16 and adults over 60 should have an annual eye test and the rest of the population should have one every two years unless they have been advised otherwise.

BBC: Photo of an eye examination