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

"You find a lot of middle and upper managers don't feel comfortable letting people out of their sight, " says Prof Rockmann.

BBC: Has mobile working come of age?

The woman seemed to be oblivious because she didn't stand up until the car was out of sight.

NPR: Literature and Lullabies from the 'Axis of Evil'

We were seated in a back row safely out of sight so I wouldn't be visible when the camera panned the grinning, waving crowd before each station break.

WSJ: Remembering a time before 'Tonight' left New York