The operation we can perform on it is to shift the bottom note to the top.

我们可以对其进行的操作是将底部的音符移到顶部。

It returns to the triumphant E-flat major, the same chord it started with but inverted, meaning Mozart moved the bottom note to the top.

它回到了胜利的降 E 大调，与它开始时相同的和弦但是倒置了，这意味着莫扎特将底部的音符移到了顶部。

As an acoustical phenomenon, an octave is defined as the interval in which the vibrational frequency of the bottom note is half that of the top note.

作为一种声学现象，八度音阶指的是音程，其中底部音符的震动频率是顶部音符的一半。