Unlike the major scale, three different minor scales exist.
（和大调不同，小调有三种）
Composers will often merge two of these scales, natural minor and harmonic minor, for a more pleasing sound.
（为了让音乐听起来更好，作曲家经常会融合自然小调和和声小调这两种小调）
Recall the diatonic triads of both scales.
（我们回忆一下这两种小调的全音三和弦）
Notice that many of the triads are the same.
（可以看到很多三和弦是一样的）
Three pairs of triads (III–III+, v–V, and VII–viio) are different due to harmonic minor's raised seventh degree.
（由于和弦小调的第七个音向上升了半度，所以有三对三和弦不一样（III–III+, v–V, 和 VII–viio））
III is prefered to III+. This is because III+, being an augmented chord, has a peculiar sound.
（III+较III更多使用，这是因为III+是增和弦，它的音响很独特）
V is preferred to v since V contains a leading tone (and therefore is stronger). This does not mean that v cannot be used.
（V较v更多使用，这是因为V包含一个导音（音响更强），但这不意味着v不能使用）
VII and viio are both used equally. As you will later learn, each has a different function.
（VII和viio的使用频率都差不多，后面学到它们时会有不同的功能）
The merged minor scale contains nine different diatonic triads.
（将这两个小调融合起来就一共有九种不同的三和弦）