研究人员猜测，这些乌鸦从父母和鸦群的其它成员那里学会了辨认有威胁的人类。

The researchers hypothesize that crows learn to recognize threatening humans from both parents and others in their flock.

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这份关于学生睡眠质量的调查是由一群研究人员推进的。

The survey was conducted by a group of researchers, which was about the quality of students' sleep.

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这些区域是研究人员应该定位并保护的中心区域，这是维持珊瑚礁群的一种方法。

These should be the area of concentration for researchers to locate and protect those regions as a way to sustain coral reefs.

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So when we talk about a cohort study, this means taking a group of people and following them over time.

所以当我们提到定群研究,就意味着,有一群人参加实验并需一直追踪下去

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A cohort study means you take the same group of people and follow them every five years for that period of time.

定群研究意味着你只有一组研究对象,然后在研究期间每五年进行一次记录数据

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Through many decades of study, biologists have teased out certain populations of cells within the bone marrow that are capable of reproducing subsets of cells.

经过数十年的研究,生物学家们在骨髓中发现了,一些细胞群,它们能够生成细胞亚群

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