In the middle of a study period, you must be a little tired.

在学习期间，你一定有点累了。

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Yet the complexities that confront those who would study such materials are not wholly different from those recently surmounted by historians of criminal law in England during the same period.

然而，研究这类材料的人所面临的复杂性，与英国刑法史学家最近在同一时期所克服的复杂性并没有完全不同。

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A 2015 study from the University of California, Berkeley, found that teens who go to bed late are more likely to gain weight over a five-year period.

加州大学伯克利分校2015年的一项研究发现，晚睡的青少年在五年内更有可能长胖。

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But in a recent study they declared that forty percent of the tweets captured over a two-week period were "pointless babble."

VOA: special.2009.09.14

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

They used information gathered over a period of 20 years, until 2003, in the Framingham Heart Study.

VOA: special.2009.01.21

It's also worth chucking into the mix that the global average temperature variation between even the strongest El Nino event and the next ordinary year is a fraction of a degree Celsius - certainly less than the rise of about 0.6C that we've seen since the beginning of the study period, in 1950.

BBC: Warm, wet - and warring?

In 24, 000 couples, the HIV-infected partner had received treatment at the start of the study period - to test out the preventative benefits - while 14, 800 had not.

BBC: Partner treatment 'cuts HIV transmission'

Because of the long follow-up period of the study, in which participants who were dementia-free developed the condition many years later, this is a less likely explanation, but was not ruled out in the research, Saczynski said.

CNN: STORY HIGHLIGHTS