Observational studies, yes. But no true experiments.

虽然有观察性研究。但没有进行过真正实验。

There's lots of other observational evidence as well.

还有很多其他观测证据。

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。

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

观察人群是磨练观察能力绝佳方式。

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

不过这些多都是在观察研究基础上，因而有可能产误导。

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

对于命诞可能契机，我们有两项观测得来佐证。

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

是对冷暗物质观测反例，不对！

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

现场实验干涉形式是所有观测方法中最极端。

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

这些调查都是观测性，并非双盲临床试验，因此它们并不完全是决定性。

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

实际上，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年来澳利亚有毒物情报中心通话信息数据。

Important caveat: this research is just an observational study.

这项研究只是观察性研究。

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

现场实验和其他观察方法本质区别在于，现场实验中研究人员有较控制权。

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

但他同时表示，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，尤其是在视觉发挥重要作用领域。

To correct for the observational efficiency.

令我可以修正观测效率。

Uh, no, I'm really more comfortable in an observational role during sexercise.

这种求爱练习我还是旁观下就好。

It was an observational study. In a controlled study, some patients would have taken aspirin.

这是一项观察性研究。在一项对照研究中，一些患者会服用阿司匹林。

Suspect harmful compounds in processed meat, and analysis of more than 800 observational studies is what led them to their conclusion.

他们在对八百多项观察性研究分析后得出了这个。

Also, Andersen said, the study is observational, meaning it can only show there is a link between egg consumption and heart disease.

安德森还表示，这项研究是观察性研究，意味着它只能表明鸡蛋摄入量与心脏病之间存在关系。