One group of children was a control group; the second group was taught to think back to experience that make them laugh or smile.

一群小孩组成对照组;,有人教第二组小孩回想,让他们大笑或微笑的经历。

哈佛公开课 - 幸福课课程节选

A second implicit purpose for the youngster-aged group is a baby-sitting purpose.

对青少年群体来说,第二个深层目标,充当临时保姆。

麻省理工公开课 - 媒体、教育、市场课程节选

The second case study of moral feeling is "in-group" and "out-group."

第二个道德情感的案例分析,是“内群体”与“外群体”

耶鲁公开课 - 心理学导论课程节选

The second thing that he found was this group, they were always asking questions, -always asking questions, initially of their boss, later of their employees, of their partners, children, parents, friends.

他发现的第二件事是，这部分人，一直在问问题，一直问问题，最初是问他们的老板，后来是问他们的雇员，他们的搭档，孩子，父母，朋友。

哈佛公开课 - 幸福课课程节选