He said each show has a main idea or theme.

VOA: special.2010.01.08

This gets back to my main theme of Tuesday, which is be systematic.

我周二会把这个问题作为主题，也就是系统化编程。

麻省理工公开课 - 计算机科学及编程导论课程节选

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

More fundamentally, I want to get back to what I think of as the main theme of 6.00, which is taking a problem and finding some way to formulate the problem so that we can use computing to help us get an answer.

花一些时间来讲,更重要的是我想，回到我认为的6。00的重点,即处理问题并公式化问题,从而使我们能够靠电脑得出答案。

麻省理工公开课 - 计算机科学及编程导论课程节选