But he conceded that the research does not establish a causal link and that the study did not control for many possible variables.

但是他也承认这项研究并未建立一个因果关系的关联，而且该研究没有控制许多可能的变量。

youdao

Going forward, researchers would like to study the long-term effects of BPA and triclosan in people to see if they can establish a causal relationship.

继续深入的话，研究人员可能会研究BPA和三氯生暴露对人体的长期影响，试图验证二者之间有无因果关系。

youdao

‘We have identified the causal medical condition underlying Henry’s reproductive problems and psychological deterioration, ’ the authors said in a study published in The Historical Journal.

“我们确认，这种具有因果关系的疾病是亨利的生育障碍和精神崩溃的基本条件，”《历史杂志》的一篇研究报告中说道。

youdao

Assuming the relation between test scores and future growth is indeed causal, the OECD study also works out the economic benefits of improving cognitive skills by the equivalent of nine months' worth of schooling.

ECONOMIST: Spending on education

First, as Dr. Goodall makes pains to point out, this study does not advocate a causal association between physician-led hospitals and their performance.

FORBES: Do Doctors Make the Best Hospital Administrators?

Study after study has concluded there is no causal link between the reduction in nuisance crimes, like turnstile jumping or aggressive panhandling, and the reduction in serious crimes, like robbery and murder.

FORBES: Rudy Giuliani Still Egregiously Wrong On Crime