Since Ruby allows for easy extension of the language, why not write our own method?
既然Ruby对语言的扩展非常简单，为什么我们不自己写一个方法？
The extension of this method is discussed.
本文将讨论这一方法的进一步扩充。
The following example declares an extension method that retrieves the shallow value of an element.
下面的示例声明了检索元素浅值的扩展方法。
Among of them the first two methods are the extension of the net-value method.
三者中的前两者是净利法的推广。
Among of them the first two methods are the extension of the net-value method.
三者中的前两者是净利法的推广。
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