Each program brings together different subjects and extends in length over two or three quarters.

VOA: special.2009.03.05

Right. Another way of saying it is there isn't random assignment of the subjects to the two conditions in the study.

换种方式说,受试者并不是随机安排在,这个研究中的两种情况下。

耶鲁公开课 - 心理学导论课程节选

Now here's a study that was done ten years later in nineteen-ninety-two, in this case it was with obese subjects.

这个实验是十年后的1992年做的,研究主题是肥胖

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

This meant they required two or fewer of the seven subjects.

VOA: special.2009.10.22

She gets help in those subjects from Shirley Mickel, a sixty-two-year-old-volunteer.

VOA: special.2010.07.16

This week,we will tell about two very different subjects.

VOA: special.2010.06.22