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

So claims that--about the failure of conservation in children at different ages could be easily tested and systematically tested, and in fact, there's a lot of support for them.

关于不同年龄阶段的儿童,缺乏守恒概念的论断,能够很轻易的得到系统的检验,事实上,有相当多的证据支持这些论断

耶鲁公开课 - 心理学导论课程节选