当用户以一种不可预期的方式将环境搞坏时，使他们回到稳定时的状态通常是明智的。
Users muck around with environments in unpredictable ways, and getting them back time to a stable state is often tricky.
这本书的内容和结构，它的关键章节，教学方法都是这本书中未知或不可预期的例子。
The structure and contents of the book, its key chapters, and the educational method it employs are examples of the unknown or unpredictable aspects of the book project.
不可预期的设计问题会不断出现，因为软件的容错能力很低—比物理系统低很多。
Unexpected design issues arise constantly because software has low failure tolerances - much lower than physical systems.
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