The second part of the book is titled "Philosophy of XP" (although the first part also contains a fair amount of philosophy).
该书的第二部分是“XP哲学”（尽管第一部分也介绍了一些哲学的内容）。
The core of the whole book is two justice principles: the first one is equal free principle, and the second one is the combining of fair equality of opportunity and difference principle.
全书的核心是两个正义原则，第一个原则是平等自由原则，第二个原则是机会的公平平等原则与差别原则的结合。
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