Let me take a very straightforward example of ternary form.

我来给你们演奏一段三部曲式的曲子。

So you could think you were coming out of ternary form.

你们可以把这个看为三部曲式。

Is just ternary form, a, b, a with the second and final a slightly modified.

那就是三段式 a b a在第二部分和最后一部分会有小小的改动。

We also talked about the simplest of all of these musical forms: ternary form.

我们还讲了曲式中最简单的一种三部曲式。