It's an interesting question as to whether he really explains how a child goes from a concrete thinker to an abstract thinker, or how he goes from not having object permanence to understanding object permanence.

问题是,他是否真的解释了,儿童思维是如何从具体向抽象转变的,或是真的解释了,儿童的客体永存性概念是如何从无到有的

耶鲁公开课 - 心理学导论课程节选

What did we lose in our understanding of it as a literary object when the second half was not published?

将它置于文学作品之列来理解时,我们失去了什么？,书的后半部分没出版时？

耶鲁公开课 - 1945年后的美国小说课程节选

Object permanence is the understanding that things exist when you no longer see them.

客体永存性是指,知道某人或某物虽然现在看不见,但仍然是存在的

耶鲁公开课 - 心理学导论课程节选