They keep that night a special secret which makes them feel even closer to each other.

那天晚上的事成了他们的秘密,这让他们觉得彼此更亲近了。

耶鲁公开课 - 心理学导论课程节选

And you keep rewarding it as it gets closer to closer.

只要它的动作越来越像跳舞,你就不停的去奖励它。

耶鲁公开课 - 心理学导论课程节选