She would draft poems on the back of recipes,shopping lists, chocolate bar wrappers, pharmacy flyers and wings of envelopes.

VOA: standard.2010.06.22

PROFESSOR: So, does anyone have any questions about the set up here, does it make sense what we're looking for the bar to go back once we make some progress.

教授：所以，有人对这套装置,有疑问吗，一旦我们,取得了一些进展,我们看到这个棒又返回来。

麻省理工公开课 - 化学原理课程节选

So one very simple study by Spelke and Baillargeon: Have babies shown a block with a bar going back and forth like that.

斯皮克和巴亚热昂做了一个简单的研究,向婴儿呈现一个木块,木块中间有一个能够来回移动的木杆,就像这个样子

耶鲁公开课 - 心理学导论课程节选

So the bar just goes back and forth.

这个木杆可以来回移动

耶鲁公开课 - 心理学导论课程节选