得的知识是广泛而深入的。每章开始部分对一般性原理的描述打破了知识的局限性。而其中每个知识点都落实到实处的独到分析，又会是你体验到知识被灵活应用的喜悦。-Obtained knowledge is extensive and in-depth. The beginning of each chapter describes the general principles to break the limits of knowledge. Knowledge points, each of which