说明： 本书介绍的所有决窍是当发现错误时，不断地就以下两个问题追问自己的结果： 1.怎样才能自动地查出这个错误？ 2.怎样才能避免这个错误？ (this book about all the know-how when it is found wrong, constantly on the following two questions asking results : 1. How can automatically detect this error? 2. How can we avoid this mistake?)
