In a recently published study (one survey conducted in 1993; the follow-up in 2009), researchers found that about 80 percent of participants younger than 30 years old dreamed in color.

在最近发表的一项研究中(这项研究在1993年就开展了，2009年又进一步研究)，研究者发现，大约80%年龄在30岁以下的人做的梦是彩色的。

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They did this by examining data from a national health survey that examined participants between 1971 and 1975, known as NHANES I, and from a follow-up survey years later.

他们从一个含有1971年至1975年的参与者的全国健康调查(即NHANES I，第一次全国健康和营养检查调查)和几年后随访调查中找寻数据。

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A follow-up telephone survey was then carried out three months after the play was shown, to assess people's participation in preventing drug abuse.

在演出结束三个月后，研究小组进行了电话追踪调查，以评估人们预防药物滥用的情况。

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And a follow-up survey of 754 people suggests users could struggle to spot when they were at risk.

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C. nearly three years ago reduced the number of plastic bags ending up in the nearby Anacostia River by 60 percent and caused three-quarters of residents to cut their use of disposable bags, according to a follow-up survey.

MSN: Reusable shopping bag measure advances

To measure that hypothesis, eDJ is now running a follow-up IG survey in association with our partner ViaLumina, Ltd.

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