Previous studies have found that more optimistic people have a lower risk of developing chronic diseases, and a lower risk of premature death.

之前的很多研究已经发现，越乐观的人得慢性病的风险越低，过早死亡的风险也越低。

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Many studies have found that a basic form of learning called conditioning can happen during sleep.

许多研究发现，一种被称为条件反射的基本学习形式可以在睡眠中发生。

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Studies have found that money can, in fact, make people happier.

研究发现，金钱实际上可以让人更快乐。

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Studies have found that nicotine can be as difficult to resist as alcohol or the drug cocaine.

VOA: special.2010.03.09

Two recent studies have found that punishment is not the best way to influence behavior.

VOA: special.2009.10.21

Studies have found that aspirin may help prevent cancers of the stomach, intestines and colon.

VOA: special.2009.10.20

Studies have found that they have better results, and also spur improvements in nearby state-run schools.

ECONOMIST: Transforming Britain's schools

Studies have found that children are more likely to take risks when they aren't watched carefully.

WSJ: The Perils of Texting While Parenting

Some studies have found that cognitive behavior therapy (CBT) might be an effective method to treat IUD.

FORBES: Internet Addiction: The New Mental Health Disorder?