We have a moment of melodic inversion.

有一段旋律转。

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

这被称之为转和弦。

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

转指的是这两条动脉互相交。

So here Beethoven uses a little bit of inversion.

因此这里贝多芬采用了小小的转。

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转。

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

所以大动脉转（TGA），顾名思义，就是指这两个动脉交了。

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

每次转都会改变和弦的声，但它永远不会停止成为 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-大动脉转，即L-TGA，左旋的意思是主动脉主要于肺动脉的左侧。