I liked this separation of material, a separation of the "book" and the "reference material" if you will.

我觉得本书的内容分层很不错，“书”和“参考资料”分的非常清楚，如果你需要找参考资料的话。

youdao

I liked this separation of material, a separation of the "book" and the "reference material" if you will.

我觉得本书的内容分层很不错，“书”和“参考资料”分的非常清楚，如果你需要找参考资料的话。

youdao