Here is what they did. Researchers took 60 adults and randomly split them into three groups of 20. Then they gave the groups three different types of "listen-and-repeat" learning conditions._________________________下面是他们的实验过程. 研究员聚集了60名成年人,并随机把他们分成3组每组20人.然后,他们给3组人员3种不同的"听写和复读"学习环境._________________________
