主构造函数，类的主题，有一个参数列表来接受标签字符串和回调函数的列表。
The primary constructor, which is the body of the entire class, has a parameter list that takes a label string and a list of callback functions.
这种现象与句法层面上起衔接作用的“回指”或“类指”无关，而是双重性别名词上升到主题时，语篇作者与主题化名词在认知语用层上交互作用的结果。
It is the result of interaction between the author and topicalized noun on cognitive pragmatic level when personal dual gender noun is elevated to the topicalized position.
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