In addition to diatonic triads, every major and minor scale has seven diatonic seventh chords.
（除了全音三和弦，每個大調和小調都有全音七和絃）

Let's examine the diatonic seventh chords of the C major scale.
（我們來看一下C大調的全音七和絃）

First, construct the scale.
（首先建立音階）

Next, stack three generic thirds on top of each note.
（然後在每個音上向上疊加三度）

Finally, analyze the resulting seventh chords.
（最後得到七和絃）

The first chord is C–E–G–B, a major triad and a major seventh. Therefore, it is a major seventh chord.
（第一個和絃是C-E-G-B，大三和弦加上一個大七度，所以它是一個大七和絃） |

The second chord is D–F–A–C, a minor triad and a minor seventh. Therefore, it is a minor seventh chord.
（第二個和絃是D-F-A-C，小三和弦加上一個小七度，所以它是一個小七和絃） |

The third chord is E–G–B–D, a minor triad and a minor seventh. Therefore, it is also a minor seventh chord.
（第三個和絃是E-G-B-D，小三和弦加上一個小七度，所以它也是一個小七和絃） |

The fourth chord is F–A–C–E, a major triad and a major seventh. Therefore, it is a major seventh chord.
（第四個和絃是F-A-C-E，大三和弦加上一個大七度，所以它是一個大七和絃） |

The fifth chord is G–B–D–F, a major triad and a minor seventh. Therefore, it is a dominant seventh chord.
（第五個和絃是G-B-D-F，大三和弦加上一個小七度，所以它是一個屬七和絃） |

The sixth chord is A–C–E–G, a minor triad and a minor seventh. Therefore, it is a minor seventh chord.
（第六個和絃是A-C-E-G，小三和弦加上一個小七度，所以它是一個小七和絃） |

The seventh chord is B–D–F–A, a diminished triad and a minor seventh. Therefore, it is a half-diminished seventh chord.
（第七個和絃是B-D-F-A，減三和弦加上一個小七度，所以它是一個半減七和絃） |

The eighth chord is a repetition of the first (C–E–G–B), making it a major seventh chord.
（第八個和絃重複第一個和絃（C-E-G-B），它是大七和絃） |

The first seventh chord of a major scale will always be a major seventh, the second and third seventh chords will always be minor sevenths, etc.
（大調的第一個七和絃一定是大七和絃，第二個、第三個和絃肯定是小七和絃）

Next, we will uncover the diatonic seventh chords of the C Natural Minor scale.
（接下來我們看一下C的自然小調的全音七和絃）

First, construct the scale.
（首先建立音階）

Again, stack three generic thirds.
（然後三度疊加）

Finally, let's analyze the resulting seventh chords.
（然後我們分析一下得到的七和絃）

The first chord is C–E-flat–G–B-flat, a minor triad and a minor seventh. Therefore, it is a minor seventh chord.
（第一個和絃是C-降E-G-降B，小三和弦再加一個小七度，所以它是小七和絃） |

The second chord is D–F–A-flat–C, a diminished triad and a minor seventh. Therefore, it is a half-diminished seventh chord.
（第二個和絃是D-F-降A-C，減三和弦再加一個小七度，所以它是半減七和絃） |

The third chord is E-flat–G–B-flat–D, a major triad and a major seventh. Therefore, it is a major seventh chord.
（第三個和絃是降E-G-降B-D，大三和弦再加一個大七度，所以它是大七和絃） |

The fourth chord is F–A-flat–C–E-flat, a minor triad and a minor seventh. Therefore, it is minor seventh chord.
（第四個和絃是F-降A-C-降E，小三和弦再加一個小七度，所以它是小七和絃） |

The fifth chord is G–B-flat–D–F, a minor triad and a minor seventh. Therefore, it is also a minor seventh chord.
（第五個和絃是G-降B-D-F，小三和弦再加一個小七度，所以它是小七和絃） |

The sixth chord is A-flat–C–E-flat–G, a major triad and a major seventh. Therefore, it is a major seventh chord.
（第六個和絃是降A-C-降E-G，大三和弦再加一個大七度，所以它是小七和絃） |

The seventh chord is B-flat–D–F–A-flat, a major triad and a minor seventh. Therefore, it is a dominant seventh chord.
（第七個和絃是降B-D-F-降A，大三和弦再加一個小七度，所以它是屬七和絃） |

The eighth chord is a repetition of the first (C–E-flat–G–B-flat), making it a minor seventh chord.
（第八個和絃重複第一個（C-降E-G-降B），它是小七和絃） |

Next, we will discuss the diatonic seventh chords of harmonic minor.
（接下來我們看一下和聲小調的全音七和絃）

To convert natural minor to harmonic minor, the seventh tone is raised a half step. Therefore, each B-flat (the seventh tone of C minor) is raised to a B.
（把自然小調的第七個音向上升一個半音即可得到和聲小調。降B（C小調的第七個音）就變成了B）

Each chord which contained a B-flat needs to be reanalyzed.
（原來帶有降B的所有和絃都要重新分析）

The first chord is now C–E-flat–G–B, a minor triad and a major seventh. Therefore, it is minor-major seventh chord.
（第一個和絃是C-降E-G-B，小三和弦再加一個大七度，所以它是小大七和絃） |

The third chord is now E-flat–G–B–D, an augmented triad and a major seventh. Therefore, it is augmented-major seventh chord.
（第二個和絃是降E-G-B-D，增三和弦再加一個大七度，所以它是增大七和絃） |

The fifth chord is now G–B–D–F, a major triad and a minor seventh. Therefore, it is a dominant seventh chord.
（第五個和絃是G-B-D-F，大三和弦再加一個小七度，所以它是屬七和絃） |

The seventh chord is now B–D–F–A-flat, a diminished triad and a diminished seventh. Therefore, it is a fully-diminished seventh chord.
（第六個和絃是B-D-F-降A，減三和弦再加一個減七度，所以它是全減七和絃） |

The eighth chord is a repetition of the first (C–E-flat–G–B-flat), making it a minor-major seventh chord.
（第八個和絃重複第一個和絃（C-降E-G-降B），所以它是小大七和絃） |

Finally, we will discuss the diatonic seventh chords of melodic minor.
（最後，我們來看一下旋律小調的全音七和絃）

To convert harmonic minor to melodic minor, the sixth tone is raised a half step. Therefore, each A-flat (the sixth tone of C minor) is raised to an A.
（將和聲小調的第六個音向上升一個半音即可得到旋律小調，將降A（C小調的第六個音）向上移一個半音得到A）

Each chord which contained an A-flat needs to be reanalyzed.
（所有包含降A的和絃都要重新分析）

The second chord is now D–F–A–C, a minor triad and a minor seventh. Therefore, it is a minor seventh chord.
（第二個和絃是D-F-A-C，小三和弦再加一個小七度，所以它是小七和絃） |

The fourth chord is now F–A–C–E-flat, a major triad and a minor seventh. Therefore, it is a dominant seventh chord.
（第四個和絃是F-A-C-E，大三和弦再加一個小七度，所以它是屬七和絃） |

The sixth chord is now A–C–E-flat–G, a diminished triad and a minor seventh. Therefore, it is a half-diminished seventh chord.
（第六個和絃是A-C-降E-G，減三和弦再加一個小七度，所以它是半減七和絃） |

The seventh chord is now B–D–F–A, a diminished triad and a minor seventh. Therefore, it is also a half-diminished seventh chord.
（第七個和絃是B-D-F-A，減三和弦再加一個小七度，所以它是半減七和絃） |

Use this chart to reference the diatonic seventh chords in each scale.
（這張表是本課所講的調式中的全音七和絃）