And the idea of this--What that means is that development of an individual mimics or repeats development of the species.

这个短语的意思是,个体的发展,模拟或重演了种族的发展

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But he studied development of the individual child because he was convinced that this development will tell him about the development of knowledge more generally.

但是,由于他深信,个体儿童的发展,能够表现出认识发展的一般规律,所以他才选择去研究个体儿童的发展

耶鲁公开课 - 心理学导论课程节选