本文的重点在于系统的磁路设计，采用信号相关性运算比较被测钢管信号和模板信号缩小端头盲区的“无盲区”方法。

The main parts of the article are the designation of magnetic path for the detecting system and the "no blind areas" method, which is based on the signal relativity operation.

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逻辑运算符的优先级低于单独的比较运算符，这一点意义重大，因为必须先计算比较运算符，然后才能计算逻辑运算符。

The logical operators have lower precedence than the individual comparison operators, which makes sense because the comparison has to be evaluated before the logical operator can be evaluated.

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然而，所有逻辑和比较运算符都全部返回值1，表示真。

However, all the logical and comparison operators consistently return the value 1 for true.

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Now, less than is just, if you haven't used it before, it's just the operator you'd expect, it's comparing two things and it's going to return either true or false depending on whether the first argument is false less than the second argument.

现在，小于这个符号是，如果你之前没用过它的话，它就是你期望的那个运算符，它会比较两个独享,然后基于第一个参数是不是,小于第二个参数,返回true或者。

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