It's not only the study of human population, but the populations of non-human species, including viruses.

这不仅是对人类种群的研究，也是对非人类种群（包括病毒）的研究。

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But other scientists disagree, saying the Danish study excluded business users and included as non-users people who began using mobiles later on.

但还有其他的科学家并不赞同这种说法，他们说丹麦的这项研究排除了商业用户，并把刚开始使用手机的人列为非手机用户。

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This study did not provide a calculation for the lives saved in the non-cycling population but it stands to reason that they would also benefit from the improved air quality.

这项研究没有提供数据表明这一计划挽救了多少那些不骑车的人的生命，但是很显然，他们也同样受益于空气质量的改善。

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This is obviously a non-scientific study, but gamblers with extra capital (if there is such a thing) may take note.

FORBES: Betting On The Super Bowl, On The Stock Market

But according to a study released this week by the non-partisan Pew Charitable Trusts, for the vast majority of young people, college still offers a path to financial success.

FORBES: It Still Pays To Get A College Degree

In 2011, DSOs performed 10.15 procedures per patient, DSO Kool Smiles (which Laffer openly noted funded the study but had no input) performed 8.24 and non-DSO dentists performed 12.39.

FORBES: George Soros & PBS V. Arthur Laffer