So you can hear, the triplet being inserted, so a triplet is simply insertion of three notes in the place of two, not more complicated than that.

大家听到,插入了三连音,三连音只是简单地,在原来两个音符的位置上换成三个音,没有更复杂的概念了

耶鲁公开课 - 聆听音乐课程节选

The bass is going where the upper voice has .

低音出现在原来高音的位置上

耶鲁公开课 - 聆听音乐课程节选