I imagine that what a Freudian would have to say is, you would expect systematic differences.

我猜精神分析的支持者会说，你会看到系统的差异。

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