因此，天文爱好者们都被鼓动了起来，尽可能频繁地拍摄旋涡星系，以此填补世界上最强大的望远镜的间歇性观察当中的时间空隙。

Therefore, sky enthusiasts are encouraged to image the Whirlpool galaxy as often as possible to fill in time gaps left by intermittent observations made by the world's most powerful telescopes.

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在观察性研究中，我们发现一些维生素 B 是有益的。

In the observational studies we found that some of the B vitamins were beneficial.

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科学家们将研究树木的多样性并观察哪些树木结果实。

The scientists will study the variety of trees and observe which are fruiting.

《柯林斯英汉双解大词典》

There is a bias toward boys or a bias against girls there So you have to look at a lot of things about websites and software You have to look at gender, you have to look at nationality, language, accessibility, so major for issues.

一种对于男孩偏爱却对女孩偏见的态度,因此对于网页和软件,我们必须仔细观察,必须观察性别，国籍，语言，可接近性等一系列重要的问题。

麻省理工公开课 - 媒体、教育、市场课程节选

Now the epidemiology studies are observational studies.

流行病学研究是观察性研究

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选