He used long talks with patients and the study of dreams to search for the causes of mental and emotional problems.

VOA: special.2010.04.13

And then the most surprising thing of all was a study done not long ago, published in 1997 of registered dieticians.

不久前的实验中,让人惊奇的事发生了,在1997年由注册营养学家发表

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But the study says it can be more economical in the long term than using fuels like gasoline, diesel or kerosene.

VOA: special.2010.01.11

Last year,Doctor Chan reported that a long-term study of almost fifty thousand men showed that aspirin can help prevent colon cancer.

VOA: special.2009.09.01

The study in Benin found that solar-powered pumps are effective in supplying water, especially during the long dry season.

VOA: special.2010.01.11

Last year Doctor Chan reported that a long-term study of almost fifty thousand men showed that aspirin can help prevent colon cancer.

VOA: special.2009.08.19

But she says the research does show the need to study whether or not there are long-lasting effects of repeated exposure over several years.

VOA: special.2011.03.02

And officials said the study had begun long before the latest debate on health reform.

VOA: special.2009.11.25

Fitzgerald says his randomized study provides additional support for previous studies that suggested doctors are sometimes waiting too long before beginning treatment for HIV-infected patients.

VOA: standard.2010.07.21

But in a study involving the HeartMate II pump, survived that long.

VOA: standard.2010.01.27