理书。即理清书的内容和层次结构。从内容上讲,就是要理清书中有哪些基础知识,即基本概念和基本原理。不仅要把这些基础知识找出,画下来,而且还要理解和记忆这些基础知识。从结构上讲,就是要理清书上讲了几个问题,先说的是什么问题,后说的是什么问题;从哪几个层次从什么角度来 Book. That is, the contents and hierarchy of the book are sorted out. In terms of content, it is to sort out what basic knowledge is in the book, namely basic concepts and basic principles. It is not only necessary to find out and draw these basic knowledge, but also to understand and remember these basic knowledge. Structurally speaking, it is necessary to sort out several problems in the book. What is the first problem and what is the problem afterwards? From what perspective