In music, the verb invert means to move the lowest note in a group an octave higher.
（在音樂中，“轉位元”的意思是把最低音往上移一個八度）

In this lesson, we will be inverting intervals.
（本課中，我們來學習音程轉位）

For our first example, let's invert a perfect fifth: C to G.
（我們把C到G的純五度作為轉位的第一個例子） |

To invert this interval, move the lowest note (the C) an octave higher.
（將此音程中最低音（也就是C）向上移一個八度）

The result is a perfect fourth: G to C.
（音程就變成了G到C的純四度） |

Next, let's invert a perfect fourth: F-sharp to B.
（接下來我們做升F到B的轉位） |

Move the lowest note an octave higher.
（將最低的音符向上移動一個八度）

The result is a perfect fifth: B to F-sharp.
（結果就變成了B到升F的純五度） |

Perfect intervals will always invert to other perfect intervals.
（純音程在轉位後仍然是純音程）

Fourths and fifths will invert to each other.
（純四度和純五度總是在兩者間轉換）

Let's invert a major third: C to E.
（下麵是大三度C到E的轉位） |

Move the lowest note an octave higher.
（將最低音向上移一個八度）

The result is a minor sixth: E to C.
（結果就變成了E到C的小六度） |

Let's invert a minor third: E to G.
（下來是小三度E到G的轉位） |

Move the lowest note an octave higher.
（將最低音向上移一個八度）

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

Minor intervals and major intervals invert to each other.
（大音程和小音程在轉位後會互相轉換）

Thirds and sixths invert to each other.
（三度和六度會互相轉換）

Let's invert a major seventh: C to B.
（接下來我們將C到B的大七度轉位） |

Move the lowest note an octave higher.
（將最低音向上移一個八度）

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.
（二度和七度在轉位後會互相轉換）

Finally, diminished and augmented intervals invert to each other.
（最後，增音程和減音程會互相轉換）

To demonstrate this, let's invert an augmented fourth: C to F-sharp.
（演示一下，我們將C到升F的增四度轉位） |

Move the lowest note an octave higher.
（將最低音向上移一個八度）

The result is a diminished fifth: F-sharp to C.
（得到升F到C的減五度） |

Use this chart to quickly invert intervals.
（用這張表所示可以快速進行音程的轉換）