While the main body of the book was about postures and movements of the body and energy, which Mr. Wu had no trouble interpreting, the introduction was basically a treatise about metaphysics.

书的主干部分关于身体的姿势、动作和能量，这部分吴先生解释起来没有一点困难，导言部分基本是一篇关于形而上学的文章。