返回的答案将是2、9、12或16，它告诉您系统正在使用的值。
The answer will come back 2, 9, 12, or 16, which tells you what you're using.
而另外一件需要考虑的事情是，我们正在处理值类型(或使用现在普遍接受的术语：“数据转移对象(Data Transfer Objects)”)。
Yet another consideration is that we are dealing with value types (or to use the now commonly accepted term, "Data Transfer objects"). To quote from Martin Fowler's pithy description of these objects.
如果启用了污染模式，Perl会产生错误并停止执行，它还会识别出正在使用的受污染值。
Perl generates errors and stops execution if taint mode is enabled and it identifies a tainted value being used. For example, using an insecure PATH generates the following error.
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