I mentioned the book for the course and the book is a book that I've written.

我提到过这门课程用到的教材,这本书是我写的

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whereas for me, it is a completely different, you know, subject material.

但对我来说，这是完全不同的课程教材。

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It's simply material found on page fifteen of your textbook but let's review it. We say this is a beginning course so we assume no previous knowledge.

这是你们教材十五页上的一些简单材料,我们复习一下,我们说这是个入门课程,所以假设之前你们没有任何相关知识

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