So you can imagine a bead with a wire going through it and the bead can only slide back and forth.

你可以想象一个穿在绳子上的珠子,小珠只能前后滑动

耶鲁公开课 - 基础物理课程节选

To test this, the psychologist Harlow performed a series of ingenious experiments with nonhuman primates wire mothers distinguishing between what he called "wire mothers" And you'll see illustrations of this to follow.

为了验证，心理学家哈洛,用非人类灵长类做了一系列独创性试验,区别“,下面你可以看到实验描述。

耶鲁公开课 - 心理学导论课程节选