And he had a stage theory, which was quite different from the Freudian stage theory that we have been introduced to.

他提出了一个阶段理论,这个阶段理论与我们之前所介绍的,弗洛伊德的阶段理论有着很大的不同

耶鲁公开课 - 心理学导论课程节选

And his discoveries that-- they did them in different ways at different ages led to the emergence of the Stage Theory.

他发现,儿童在不同的年龄拥有不同的行为方式,他根据这一发现提出了阶段理论

耶鲁公开课 - 心理学导论课程节选