It's a very funny poem, and you've got triplet rhymes there to make sure you know that Frost is joking, and it feels like light verse.

这是首有趣的诗，你会得到三连音的押韵,让你确实觉得弗罗斯特在开玩笑，这就像光的韵律一样。

耶鲁公开课 - 现代诗歌课程节选

The second rhythmic device that we have to be aware of in music we frequently encounter is this concept of the triplet.

音乐中第二个需要知道的节奏符号,就是我们经常遇到的三连音

耶鲁公开课 - 聆听音乐课程节选

Both melody and bass could have had a triplet but he chose to have the duple in the bass--the triple up above.

旋律和低音部都可以运用三连音,但是他选择低音两拍,高音三拍

耶鲁公开课 - 聆听音乐课程节选

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