Observational studies, yes. But no true experiments.

虽然有观察性研究。但没有进行过真验。

There's lots of other observational evidence as well.

还有很多其他观测证据。

People-watching is a fantastic way to sharpen your observational skills.

观察人群磨练观察能力绝佳方式。

And so we want to tease those out from observational data.

所以我们想从观测数据中梳理出这些。

But these were mostly based on observational studies, which can be misleading.

不过这些结论大多都在观察研究基础上，因而有可能产生误导。

The researchers said progress in observational technology helped them reach their findings.

研究人员示，观测技术进步帮助他们得出了这一发现。

Like studies on animals, large-scale observational studies are not in themselves conclusive.

与对动物研究一样，大规模观察性研究本身并不结论性。

We have two pieces of observational evidence on the probability of life appearing.

对于生命诞生可能契机，我们有两项观测得来佐证。

The field experiment represents the most extreme form of intervention in observational methods.

现场验干涉形式所有观测方法中最极端。

It's an observational rebuttal of the LambdaCdm Model of the universe! No!

对冷暗物质模型观测反例，不对！

These investigations are observational, not double-blinded clinical trials, so they are not completely conclusive.

这些调查都观测性，并非双盲临床试验，因此它们并不完全决定性。

Important caveat: this research is just an observational study.

这项研究只观察性研究。

Actually this type of study, an observational study, is very very common in nutrition research.

际上，这种观察性研究，在营养研究中非常常见。

An observational study reviewed 7 years of data from calls to Australian poison information center.

一项观察性研究回顾了7年来澳大利亚有毒物情报中心通话信息数据。

However, they were both observational, meaning it's impossible to tease out cause and effect.

然而，它们都观察到，这意味着不可能梳理出因果关系。

It confirms other observational studies that have not shown a higher risk of heart arrhythmias.

它证了其它观察性研究并未显示出较高心律失常风险。

The essential difference between field experiments and other observational methods is that researchers have more control in field experiments.

现场验和其他观察方法本质区别在于，现场验中研究人员有较大控制权。

The new image was captured using 16 telescopes around the world that, in effect, created a planet-sized observational dish.

这张新照片用世界各地16台望远镜拍下，际上，这些望远镜形成了一个行星大小观测盘。

But he said that the research was limited to one country and as an observational study does not prove causation.

但他同时示，这项研究仅限于一个国家，并且作为一项观察性研究，它不能证明任何因果关系。

Cultivating drawing talent can become an essential tool to improve people's observational skills in fields where the visual is important.

培养绘画天赋会成为帮助人们提高观察技能重要工具，尤其在视觉发挥重要作用领域。