It's just tonic or maybe throwing an anchor overboard to bring this ship to an end-- whatever sort of analogy or visual imagine you want to bring to it, but it's--the piece has ended.

它是这样，主音或者说放锚让船停下来-,无论是怎样的意境你都会感觉到，但是，这段乐曲结束了。

耶鲁公开课 - 聆听音乐课程节选