In music, the verb invert means to move the lowest note in a group an octave higher.
（在音乐中，“转位”的意思是把最低音往上移一个八度）

In this lesson, we will be inverting intervals.
（本课中，我们来学习音程转位）

For our first example, let's invert a perfect fifth: C to G.
（我们把C到G的纯五度作为转位的第一个例子） |

To invert this interval, move the lowest note (the C) an octave higher.
（将此音程中最低音（也就是C）向上移一个八度）

The result is a perfect fourth: G to C.
（音程就变成了G到C的纯四度） |

Next, let's invert a perfect fourth: F-sharp to B.
（接下来我们做升F到B的转位） |

Move the lowest note an octave higher.
（将最低的音符向上移动一个八度）

The result is a perfect fifth: B to F-sharp.
（结果就变成了B到升F的纯五度） |

Perfect intervals will always invert to other perfect intervals.
（纯音程在转位后仍然是纯音程）

Fourths and fifths will invert to each other.
（纯四度和纯五度总是在两者间转换）

Let's invert a major third: C to E.
（下面是大三度C到E的转位） |

Move the lowest note an octave higher.
（将最低音向上移一个八度）

The result is a minor sixth: E to C.
（结果就变成了E到C的小六度） |

Let's invert a minor third: E to G.
（下来是小三度E到G的转位） |

Move the lowest note an octave higher.
（将最低音向上移一个八度）

The result is a major sixth: G to E.
（结果为G到E的大六度） |

Minor intervals and major intervals invert to each other.
（大音程和小音程在转位后会互相转换）

Thirds and sixths invert to each other.
（三度和六度会互相转换）

Let's invert a major seventh: C to B.
（接下来我们将C到B的大七度转位） |

Move the lowest note an octave higher.
（将最低音向上移一个八度）

The result is a minor second: B to C.
（就得到B到C的小二度） |

Seconds and sevenths invert to each other.
（二度和七度在转位后会互相转换）

Finally, diminished and augmented intervals invert to each other.
（最后，增音程和减音程会互相转换）

To demonstrate this, let's invert an augmented fourth: C to F-sharp.
（演示一下，我们将C到升F的增四度转位） |

Move the lowest note an octave higher.
（将最低音向上移一个八度）

The result is a diminished fifth: F-sharp to C.
（得到升F到C的减五度） |

Use this chart to quickly invert intervals.
（用这张表所示可以快速进行音程的转换）