We have a moment of melodic inversion.

有一段旋律位。

Well, that'd be what's called a chord inversion.

这被称位和弦。

" Transposing" is when two things switch places with each other.

位指的是这两条动脉互相交换位置。

So here Beethoven uses a little bit of inversion.

因此这里贝多芬采用了小小的位。

So there we had just a moment of Leonard Bernstein writing a little bit of inversion.

我们了一部分伯恩斯坦的这首赋格带有一小段位。

So transposition of the great arteries, or TGA —you might be able to guess— is when these two arteries swap locations.

所以大动脉位（TGA），顾名思义，就是指这两个动脉交换了位置。

Each inversion changes the sound of the chord, but it never stops being a C diminished seventh.

每次位都会改变和弦的声，但它永远不会停止成 C 减七。

Less commonly, babies can have levo-transposition of the great arteries, or l-TGA, with levo meaning that the aorta's primarily to the " left" of the pulmonary artery.

更少见地，宝宝可能会有左旋-大动脉位，即L-TGA，左旋的意思是主动脉主要位于肺动脉的左侧。