This inheritance isn't accidental — it's what makes environment variables useful — but it also makes them a serious security problem.

这种继承不是偶然的——这是为了使环境变量有用——但是这也使之成为一个严重的安全问题。

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Doing this not only has made the code more testable, but also made it not depend on the global variables in the method.

这样做不仅使代码变得更具可测试性，而且也使它不依赖于方法的全局变量。

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Class variables must also be used with care, but they are precisely the right tool for introducing names for constants, as discussed in the following section.

类变量同样需要小心使用，但它们又恰恰是引入下一部分要讨论的常量命名的最好工具。

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