Most American colleges and universities use the grading system of A,B,C,D and F.

VOA : special.2009.03.05

So today and Monday we're going to talk about two very big ideas and these ideas are associated with Sigmund Freud and B. F. Skinner and are psychoanalysis and behaviorism.

所以在今天和星期一,我们将学习两大心理理论,其代表人物分别是,西格蒙特·弗洛伊德和,伯尔赫斯·弗雷德里克·斯金纳,这两个理论便是精神分析理论,和行为主义理论。

心理学导论课程节选 : 耶鲁公开课

This refers--this actually goes back to B.F. Skinner, a psychologist who flourished in the first half of this century.

这要追溯到B.F.斯金纳,一位活跃在上世纪前期的心理学家

金融市场课程节选 : 耶鲁公开课

Tim Whittman at the F.B.I.

VOA : special.2010.06.14

Tim Whittman from the F.B.I.

VOA : special.2010.06.14