there were 250 kids who got nothing, who were also studied, 250 kids in the control group.

有另外250个孩子，他们什么也没得到，也列为了研究对象，250名对照组的孩子。

哈佛公开课 - 幸福课课程节选

Now, what they did was--they were clever psychologists so they set it up in a study where the people did not know sexual orientation was at issue.

他们都是聪明的心理学家,他们设计了一个实验,实验对象并不知道研究的是同性恋问题。

耶鲁公开课 - 心理学导论课程节选