They’ve since moved to human trials, testing 80 people in four studies.

取得上述进展后，他们进展至人体试验阶段，研究了4组人群，共80个样本。

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Across four studies the researchers examined how people thought about each of these challenges.

研究者透过四个研究来检验人们分别如何思考这四个挑战。

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Chapter four studies the equity and efficiency in the public sector's work results and their audit.

第四章阐述公共部门工作结果的公平与效率及其审计。

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An analysis of four studies found no difference in short-term survival when rescuers followed current guidelines.

VOA: special.2010.09.15

These studies were done in France with four-day-old babies.

这些实验在法国对四天大的婴儿进了研究

耶鲁公开课 - 心理学导论课程节选

But scientists reported that the evidence was stronger when they combined the results of the four major studies done so far.

VOA: special.2009.08.12

When researchers combined data from the 168 young people in these four studies, they found no evidence that homeopathic treatments were of benefit for ADHD.

CNN: Do homeopathic treatments for ADHD work?

In the first of four studies, Cowles charted the weekly individual stock purchase recommendations of 16 established Wall Street firms from January 1928 to June 1932.

FORBES: Gurus are Still Wrong After 80 Years

Four studies in recent years identified modest declines, but a new one that looks separately at Americans lacking a high school diploma found disturbingly sharp drops in life expectancy for whites in this group.

FORBES: Falling Life Expectancy In the United States