An interval measures the distance between two notes.
（两个音符的距离用音程来衡量）

We will first discuss generic intervals, which are measured on the staff.
（首先我们来看在五线谱上使用的通用音程）

When two notes occupy the same line or space, they are a first (or a prime) apart.
（当两个音符在五线谱上处于同一线或同一间时，就是同度）

C to C is an example of a first.
（C-C就是一个同度的例子）

D to D and E to E are also firsts.
（D-D，E-E也都是同度）

Accidentals are ignored when measuring generic intervals, only staff position matters.
（通用音程不考虑变音，在五线谱上的位置是唯一的衡量法则）

C—C-sharp, D—D-flat, and A-sharp—A-flat are still firsts.
（C-升C，D-升D，A-升A也都是同度）

As the notes become further apart on the staff, the interval type increases.
（音程随着音符的距离而变化）

C—D, D—E, and E—F are all seconds.
（C-D、D-E、E-F都是二度）

C—E, D—F, and E—G are all thirds.
（C-E、D-F、E-G都是三度）

Notice that thirds will always share the same staff position type — either both on a line or both on a space.
（注意任意距离为三度的两个音在五线谱上的位置属性都一样，比如都在线上，或都在间上）

C—F, D—G, and E—A are all fourths.
（C-F、D-G、E-A都是四度）

C—G, D—A, and E—B are all fifths.
（C-G、D-A、E-B都是五度）

C—A, D—B, and E—C are all sixths.
（C-A、D-B、E-C都是六度）

C—B, D—C, and E—D are all sevenths.
（C-B、D-C、E-D都是七度）

C—C, D—D, and E—E are all eighths.
（C-C、D-D、E-E都是八度）

Use this chart to reference generic intervals.
（这张图上表示了音程）