尽管在2005年定群评价规模扩大到240万病人，但这是开始进行可靠监测以来的最高比率。

This is the highest rate since reliable monitoring began, despite an increase in the size of the cohort evaluated to 2.4 million patients in 2005.

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而采用RIA结果，该项定群研究获得了很明确的结论。

But, by using the results of RIA, our cohort study gave very definite conclusion.

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当然，某一物种或某一群物种的进化不一定增加其复杂性。

Definitely. Evolution within a species or family of species does not have to increase in complexity.

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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

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选