In some study circles it is naturally so, for example in study circles in foreign languages for beginners.

在有些学习圈中这是自然的情况，例如，一个为初学者开办的外语学习圈。

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For example, is it better to study for 4 hours straight or to study for 1 hour a day for 4 days in a row?

例如，是连续学习4个小时好，还是连续4天每天学习1个小时好？

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A 2018 study published in the Proceedings of the National Academy of Sciences, for example, followed researchers in the Netherlands.

例如，2018年发表在《美国国家科学院院刊》上的一项研究跟踪调查了荷兰的研究人员。

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For example, the study found that people in Turkmenistan and Cambodia are likely to hide insecure feelings when they are around others' laughter.

VOA: special.2009.11.17

For example, researchers in Singapore completed one such study several years ago.

VOA: special.2010.06.01

For example, the IOM study finds 58 percent of the IDP families in Diyala and 60 percent in Baghdad are without a source of income.

VOA: standard.2009.09.20

For example, in our study, 80% of those individuals with persisting ADHD had other mental health diagnosis.

FORBES: Time To Pay Attention: What The Newest ADHD Research Is Telling Us

For example, in a study published last year in the Proceedings of the National Academy of Sciences a group of researchers looked at crustaceans (crabs, shrimps, woodlice and so on) over the past 550m years and found far more examples of groups of species evolving towards complexity than in the other direction.

ECONOMIST: Evolution

For example, a study in the journal Radiology in March found that for young men with testicular cancer, the mortality risk from their cancer was three times higher than from radiation-induced cancer.

WSJ: New Tracking of a Patient's Radiation Exposure