整数文字量的，对实现的依赖性 (of integer literal, implementation dependency) 覆盖函数的 (of overriding function) 内部类型的输出 (output of built-in) ..
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In the overriding function, we are wrapping the DIV element around the delimited list of links and returning the resulting string.
在覆盖的函数中，我们在链接列表外边加上DIV元素并返回产生的字符串。
Taking this one step further, we can tell Drupal to use a template file to define the presentation of this list by defining the file name within this overriding function, as shown in Listing 10.
还可以更进一步，可以在这个覆盖函数中定义一个文件名，从而让 Drupal 使用一个模板文件定义这个列表的显示，见 清单 10。
As the construction function has three kinds of different conditions, assignment operator overriding must be given attention.
构造函数有三种情况，在重载赋值运算符时一定要分清楚。
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