It is difficult to say exactly how the music we call "rock" or "rock and roll" began. Its roots go back to many different countries and many different kinds of music and musicians.

【参考答案】

很难准确说出我们所说的“摇滚乐”是如何起源的。它的根可以追溯到许多不同的国家、不同类型的音乐和音乐家。