这本书的八章自成体系，很难分出等级。
With eight, very loosely related chapters, this book is hard to classify.
每一章均自成一篇，可单独学习。
Each chapter is self-contained and can be studied in isolation.
本书中讲述的主题变化多样，而且自成一体——例如，从一章到另一章之间没有核心观点。——所以我将简要介绍各章的内容。
The topics in this book are diverse and often self-contained — for example, there is no central argument that runs from chapter to chapter — so I will briefly describe the contents by chapter below.
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