第三課：音級

Notice that the subdominant is the same distance below the tonic as the dominant is above it. (a generic fifth).
（注意下屬音和第一個主音的距離，與屬音和最後一個主音的距離是相等的（純五度））
The prefix sub is Latin for “under” or “beneath”.
（首碼sub在拉丁語中的意思是下面，在……之下）

The third note is called the mediant since it is in the middle of the tonic and dominant.
（第三個音位於主音和屬音的中間，所以叫做中音）
Likewise, the sixth note is called the submediant since it is in the middle of the upper tonic and subdominant.
（同樣，第六個音位於上主音和下屬音的中間，所以叫做下中音）
The second note is called the supertonic. Super is Latin for “above”.
（第二個音叫做上主音，super在拉丁語中的意思是在……之上）