Observational studies, yes. But no true experiments.

虽然有观察性研究。但没有进行过真正的实验。

There's lots of other observational evidence as well.

还有很多其他的观测证据。

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

观察人群是磨练观察能力的绝佳方式。

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是在观察研究的基础上的，因而有可能产生误导。

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

研究人员表示，观测技术的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.

与对动物的研究一样，大规模的观察性研究本身并不是结论性的。

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

对于生命诞生的可能契机，我们有两项观测得来的佐证。

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

现场实验的干涉形式是所有观测方法中最极端的。

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

是对冷暗物质模型的观测反例，不对！