1·Yeah, they had this thing — they hit this thing called the octave.
是的，他们有这个，他们碰到了这个叫做八度的东西。
2·So, they had the ratio of two to one, which gave them the octave, and three to two, which gave them the fifth, and four to three, which gave them the fourth.
他们发现,八度音程中,呈现的是二比一的比例,而五度音程中呈现三比二的比例,在四度音程中则呈现四比三的比例
3·Okay, so we have — there's a whole idea of octave duplication - sometimes six notes, sometimes five notes.
现在我们了解到，一整套的重复八度，有时是六音符，有时是五音符。
4·But how they divide up this sonic space within the octave can vary rather considerably.
但他们在八度内划分声音间距的方法，却是极为不同的。
5·Parallel intervals of a fifth, octave or unison are traditionally prohibited in four-part writing.
五度，八度或一度音程平行传统上在四声部作品中禁用。