When people began sailing out of sight of land, sailors did not know how to tell where they were on the open sea.

VOA: special.2010.07.14

And even six-month-olds are sensitive to these rudimentary facts of arithmetic, telling us something about their mathematical knowledge, but also telling us something about that they expect things to remain when they're out of sight.

即便六个月大的婴儿,对算术的基础知识已经相当敏感,向我们展示了婴儿所具有的数学知识,但也同时告诉了我们,婴儿在看不到物体时,仍然会认为物体依然存在

耶鲁公开课 - 心理学导论课程节选

And to start with some real examples, a lot of this infant research has gone back to the Piagetian question of object permanence, asking, "Is it really true babies don't know that objects remain even when they're out of sight?"

下面给大家介绍一些实例,许多的婴儿研究都回到了,皮亚杰的客体永存性问题上,去探讨,"婴儿是否真的不知道,物体即使离开视线也仍然是存在的"

耶鲁公开课 - 心理学导论课程节选