It occurred to me here I could take that theme and turn it upside down against itself and it would work.

我突然发现,我能把这个主旋律颠倒过来并合在一起,还挺行得通的

耶鲁公开课 - 聆听音乐课程节选

And then in the early eighteen twenties, he decided to incorporate this as the main theme of the last movement, the finale of his last symphony.

之后,在十九世纪二十年代早期,他决定将这一段,作为结尾乐章的主旋律,也就是他最后一部交响曲的最终乐章

耶鲁公开课 - 聆听音乐课程节选

In the growth of national awareness, that itself is an important theme.

在国家意识的觉醒过程中,这永远是一个主旋律

耶鲁公开课 - 欧洲文明课程节选