You wait for the pig to do something that's halfway close to dancing, like stumbling, and you reward it.

你等到猪的动作有点像跳舞，比如它摇摇晃晃的，你就奖励它。

耶鲁公开课 - 心理学导论课程节选

They thought, for example, if you could do something with one element, if you looked at an element very close to it, it would be similar enough that you could maybe replace it with that.

他们认为，比如，用一种元素可以做的，用它邻近的元素，代替它的位置,也应该能做到。

麻省理工公开课 - 化学原理课程节选